updated Empty Runner

Services/PostgresService/controllers/core_controllers.py

@@ -0,0 +1,108 @@
+from typing import Type, TypeVar
+
+from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy.orm import Session
+
+from fastapi import status
+from fastapi.exceptions import HTTPException
+
+from Services.PostgresService.database import get_db
+
+
+# Type variable for class methods returning self
+T = TypeVar("T", bound="FilterAttributes")
+
+
+class BaseAlchemyModel:
+    """
+    Controller of alchemy to database transactions.
+    Query: Query object for model
+    Session: Session object for model
+    Actions: save, flush, rollback, commit
+    """
+
+    __abstract__ = True
+
+    @classmethod
+    def new_session(cls) -> Session:
+        """Get database session."""
+
+        with get_db() as session:
+            return session
+
+    @classmethod
+    def flush(cls: Type[T], db: Session) -> T:
+        """
+        Flush the current session to the database.
+
+        Args:
+            db: Database session
+
+        Returns:
+            Self instance
+
+        Raises:
+            HTTPException: If database operation fails
+        """
+        try:
+            db.flush()
+            return cls
+        except SQLAlchemyError as e:
+            raise HTTPException(
+                status_code=status.HTTP_406_NOT_ACCEPTABLE,
+                detail={
+                    "message": "Database operation failed",
+                },
+            )
+
+    def destroy(self: Type[T], db: Session) -> None:
+        """
+        Delete the record from the database.
+
+        Args:
+            db: Database session
+        """
+        db.delete(self)
+
+    @classmethod
+    def save(cls: Type[T], db: Session) -> None:
+        """
+        Commit changes to database.
+
+        Args:
+            db: Database session
+
+        Raises:
+            HTTPException: If commit fails
+        """
+        try:
+            db.commit()
+            db.flush()
+        except SQLAlchemyError as e:
+            db.rollback()
+            raise HTTPException(
+                status_code=status.HTTP_406_NOT_ACCEPTABLE,
+                detail={
+                    "message": "Alchemy save operation failed",
+                    "error": str(e),
+                },
+            )
+        except Exception as e:
+            db.rollback()
+            raise HTTPException(
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                detail={
+                    "message": "Unknown exception raised.",
+                    "error": str(e),
+                },
+            )
+
+    @classmethod
+    def rollback(cls: Type[T], db: Session) -> None:
+        """
+        Rollback current transaction.
+
+        Args:
+            db: Database session
+        """
+        db.rollback()

Services/PostgresService/controllers/crud_controllers.py

@@ -0,0 +1,249 @@
+import arrow
+import datetime
+
+from typing import Optional, Any, Dict
+from sqlalchemy.orm import Session, Mapped
+from pydantic import BaseModel
+from fastapi.exceptions import HTTPException
+
+from decimal import Decimal
+from sqlalchemy import TIMESTAMP, NUMERIC
+from sqlalchemy.orm.attributes import InstrumentedAttribute
+
+
+class Credentials(BaseModel):
+    """
+    Class to store user credentials.
+    """
+    person_id: int
+    person_name: str
+    full_name: Optional[str] = None
+
+
+class MetaData:
+    """
+    Class to store metadata for a query.
+    """
+    created: bool = False
+    updated: bool = False
+
+
+class CRUDModel:
+
+    __abstract__ = True
+
+    creds: Credentials = None
+    meta_data: MetaData = MetaData()
+
+    @classmethod
+    def create_credentials(cls, record_created) -> None:
+        """
+        Save user credentials for tracking.
+
+        Args:
+            record_created: Record that created or updated
+        """
+        if getattr(cls.creds, "person_id", None) and getattr(cls.creds, "person_name", None):
+            record_created.created_by_id = cls.creds.person_id
+            record_created.created_by = cls.creds.person_name
+        return
+
+    @classmethod
+    def raise_exception(cls):
+        raise HTTPException(
+            status_code=400,
+            detail={
+                "message": "Exception raised.",
+            },
+        )
+
+    @classmethod
+    def create_or_abort(cls, db: Session, **kwargs):
+        """
+        Create a new record or abort if it already exists.
+
+        Args:
+            db: Database session
+            **kwargs: Record fields
+
+        Returns:
+            New record if successfully created
+        """
+
+        # Search for existing record
+        query = db.query(cls).filter(
+            cls.expiry_ends > str(arrow.now()), cls.expiry_starts <= str(arrow.now()),
+        )
+
+        for key, value in kwargs.items():
+            if hasattr(cls, key):
+                query = query.filter(getattr(cls, key) == value)
+
+        already_record = query.first()
+        # Handle existing record
+        if already_record or already_record.deleted:
+            cls.raise_exception()
+
+        # Create new record
+        created_record = cls()
+        for key, value in kwargs.items():
+            setattr(created_record, key, value)
+        cls.create_credentials(created_record)
+        db.add(created_record)
+        db.flush()
+        return created_record
+
+    @classmethod
+    def iterate_over_variables(cls, val: Any, key: str) -> tuple[bool, Optional[Any]]:
+        """
+        Process a field value based on its type and convert it to the appropriate format.
+
+        Args:
+            val: Field value
+            key: Field name
+
+        Returns:
+            Tuple of (should_include, processed_value)
+        """
+        key_ = cls.__annotations__.get(key, None)
+        is_primary = key in cls.primary_keys
+        row_attr = bool(getattr(getattr(cls, key), "foreign_keys", None))
+
+        # Skip primary keys and foreign keys
+        if is_primary or row_attr:
+            return False, None
+
+        if val is None:  # Handle None values
+            return True, None
+
+        if str(key[-5:]).lower() == "uu_id":  # Special handling for UUID fields
+            return True, str(val)
+
+        if key_:        # Handle typed fields
+            if key_ == Mapped[int]:
+                return True, int(val)
+            elif key_ == Mapped[bool]:
+                return True, bool(val)
+            elif key_ == Mapped[float] or key_ == Mapped[NUMERIC]:
+                return True, round(float(val), 3)
+            elif key_ == Mapped[TIMESTAMP]:
+                return True, str(arrow.get(str(val)).format("YYYY-MM-DD HH:mm:ss ZZ"))
+            elif key_ == Mapped[str]:
+                return True, str(val)
+        else:           # Handle based on Python types
+            if isinstance(val, datetime.datetime):
+                return True, str(arrow.get(str(val)).format("YYYY-MM-DD HH:mm:ss ZZ"))
+            elif isinstance(val, bool):
+                return True, bool(val)
+            elif isinstance(val, (float, Decimal)):
+                return True, round(float(val), 3)
+            elif isinstance(val, int):
+                return True, int(val)
+            elif isinstance(val, str):
+                return True, str(val)
+            elif val is None:
+                return True, None
+
+        return False, None
+
+    def get_dict(self, exclude_list: Optional[list[InstrumentedAttribute]] = None) -> Dict[str, Any]:
+        """
+        Convert model instance to dictionary with customizable fields.
+        Returns:
+            Dictionary representation of the model
+            Dictionary returns only UUID fields and fields that are not in exclude_list
+        """
+        return_dict: Dict[str, Any] = {}    # Handle default field selection
+        exclude_list = exclude_list or []
+        exclude_list = [exclude_arg.key for exclude_arg in exclude_list]
+
+        columns_set = set(self.columns)
+        columns_list = set([col for col in list(columns_set) if str(col)[-2:] != "id"])
+        columns_extend = set(col for col in list(columns_set) if str(col)[-5:].lower() == "uu_id")
+        columns_list = set(columns_list) | set(columns_extend)
+        columns_list = list(set(columns_list) - set(exclude_list))
+
+        for key in columns_list:
+            val = getattr(self, key)
+            correct, value_of_database = self.iterate_over_variables(val, key)
+            if correct:
+                return_dict[key] = value_of_database
+
+        return return_dict
+
+    @classmethod
+    def find_or_create(
+            cls, db: Session, exclude_args: Optional[list[InstrumentedAttribute]] = None, **kwargs
+    ):
+        """
+        Find an existing record matching the criteria or create a new one.
+
+        Args:
+            db: Database session
+            exclude_args: Keys to exclude from search
+            **kwargs: Search/creation criteria
+
+        Returns:
+            Existing or newly created record
+        """
+        # Search for existing record
+        query = db.query(cls).filter(
+            cls.expiry_ends > str(arrow.now()), cls.expiry_starts <= str(arrow.now()),
+        )
+        exclude_args = exclude_args or []
+        exclude_args = [exclude_arg.key for exclude_arg in exclude_args]
+        for key, value in kwargs.items():
+            if hasattr(cls, key) and key not in exclude_args:
+                query = query.filter(getattr(cls, key) == value)
+
+        already_record = query.first()
+        if already_record:  # Handle existing record
+            cls.meta_data.created = False
+            return already_record
+
+        # Create new record
+        created_record = cls()
+        for key, value in kwargs.items():
+            setattr(created_record, key, value)
+        cls.create_credentials(created_record)
+
+        db.add(created_record)
+        db.flush()
+        cls.meta_data.created = True
+        return created_record
+
+    def update(self, db: Session, **kwargs):
+        """
+        Update the record with new values.
+
+        Args:
+            db: Database session
+            **kwargs: Fields to update
+
+        Returns:
+            Updated record
+        """
+        for key, value in kwargs.items():
+            setattr(self, key, value)
+
+        self.update_credentials()
+        try:
+            db.flush()
+            self.meta_data.updated = True
+        except Exception as e:
+            print('Error:', e)
+            self.meta_data.updated = False
+            db.rollback()
+        return self
+
+    def update_credentials(self) -> None:
+        """
+        Save user credentials for tracking.
+        """
+        # Update confirmation or modification tracking
+        person_id = getattr(self.creds, "person_id", None)
+        person_name = getattr(self.creds, "person_name", None)
+        if person_id and person_name:
+            self.updated_by_id = self.creds.person_id
+            self.updated_by = self.creds.person_name
+        return

Services/PostgresService/controllers/filter_controllers.py

@@ -0,0 +1,202 @@
+"""
+Advanced filtering functionality for SQLAlchemy models.
+
+This module provides a comprehensive set of filtering capabilities for SQLAlchemy models,
+including pagination, ordering, and complex query building.
+"""
+
+from __future__ import annotations
+import arrow
+
+from typing import Any, TypeVar, Type, Union, Optional
+
+from sqlalchemy import ColumnExpressionArgument
+from sqlalchemy.orm import Query, Session
+from sqlalchemy.sql.elements import BinaryExpression
+
+from Services.PostgresService.controllers.response_controllers import PostgresResponse
+
+
+T = TypeVar("T", bound="QueryModel")
+
+
+class QueryModel:
+
+    pre_query = None
+    __abstract__ = True
+
+    @classmethod
+    def _query(cls: Type[T], db: Session) -> Query:
+        """Returns the query to use in the model."""
+        return cls.pre_query if cls.pre_query else db.query(cls)
+
+    @classmethod
+    def add_new_arg_to_args(cls: Type[T], args_list, argument, value):
+        new_arg_list = list(
+            set(
+                args_
+                for args_ in list(args_list)
+                if isinstance(args_, BinaryExpression)
+            )
+        )
+        arg_left = lambda arg_obj: getattr(getattr(arg_obj, "left", None), "key", None)
+        # arg_right = lambda arg_obj: getattr(getattr(arg_obj, "right", None), "value", None)
+        if not any(True for arg in new_arg_list if arg_left(arg_obj=arg) == argument):
+            new_arg_list.append(value)
+        return tuple(new_arg_list)
+
+    @classmethod
+    def get_not_expired_query_arg(cls: Type[T], arg):
+        """Add expiry_starts and expiry_ends to the query."""
+        starts = cls.expiry_starts <= str(arrow.now())
+        ends = cls.expiry_ends > str(arrow.now())
+        arg = cls.add_new_arg_to_args(arg, "expiry_ends", ends)
+        arg = cls.add_new_arg_to_args(arg, "expiry_starts", starts)
+        return arg
+
+    @classmethod
+    def produce_query_to_add(cls: Type[T], filter_list):
+        """
+        Adds query to main filter options
+        Args:
+            filter_list:
+        """
+        if filter_list.get("query"):
+            for smart_iter in cls.filter_expr(**filter_list["query"]):
+                if key := getattr(getattr(smart_iter, "left", None), "key", None):
+                    args = cls.add_new_arg_to_args(args, key, smart_iter)
+
+    @classmethod
+    def convert(
+        cls: Type[T], smart_options: dict, validate_model: Any = None
+    ) -> Optional[tuple[BinaryExpression]]:
+        if not validate_model:
+            return tuple(cls.filter_expr(**smart_options))
+
+    @classmethod
+    def filter_by_one(
+        cls: Type[T], db: Session, system: bool = False, **kwargs
+    ) -> PostgresResponse:
+        """
+        Filter single record by keyword arguments.
+
+        Args:
+            db: Database session
+            system: If True, skip status filtering
+            **kwargs: Filter criteria
+
+        Returns:
+            Query response with single record
+        """
+        if "is_confirmed" not in kwargs and not system:
+            kwargs["is_confirmed"] = True
+        kwargs.pop("system", None)
+        query = cls._query(db).filter_by(**kwargs)
+        return PostgresResponse(
+            model=cls, pre_query=cls._query(db), query=query, is_array=False
+        )
+
+    @classmethod
+    def filter_one(
+        cls: Type[T],
+        *args: Union[BinaryExpression, ColumnExpressionArgument],
+        db: Session,
+    ) -> PostgresResponse:
+        """
+        Filter single record by expressions.
+
+        Args:
+            db: Database session
+            args: Filter expressions
+
+        Returns:
+            Query response with single record
+        """
+        args = cls.get_not_expired_query_arg(args)
+        query = db.query(cls).filter(*args)
+        pre_query = cls._query(db=db).filter(*args)
+        return PostgresResponse(
+            model=cls, pre_query=pre_query, query=query, is_array=False
+        )
+
+    @classmethod
+    def filter_one_system(
+        cls,
+        *args: Union[BinaryExpression, ColumnExpressionArgument],
+        db: Session,
+    ):
+        """
+        Filter single record by expressions without status filtering
+        Args:
+            *args:
+            db:
+
+        Returns:
+            Query response with single record
+        """
+        query = cls._query(db=db).filter(*args)
+        return PostgresResponse(
+            model=cls, pre_query=cls._query(db=db), query=query, is_array=False
+        )
+
+    @classmethod
+    def filter_all_system(
+        cls: Type[T],
+        *args: Union[BinaryExpression, ColumnExpressionArgument],
+        db: Session,
+    ) -> PostgresResponse:
+        """
+        Filter multiple records by expressions without status filtering.
+
+        Args:
+            db: Database session
+            args: Filter expressions
+
+        Returns:
+            Query response with matching records
+        """
+
+        query = cls._query(db)
+        query = query.filter(*args)
+        return PostgresResponse(
+            model=cls, pre_query=cls._query(db), query=query, is_array=True
+        )
+
+    @classmethod
+    def filter_all(
+        cls: Type[T],
+        *args: Union[BinaryExpression, ColumnExpressionArgument],
+        db: Session,
+    ) -> PostgresResponse:
+        """
+        Filter multiple records by expressions.
+
+        Args:
+            db: Database session
+            args: Filter expressions
+        Returns:
+            Query response with matching records
+        """
+        args = cls.get_not_expired_query_arg(args)
+        pre_query = cls._query(db=db)
+        query = cls._query(db=db).filter(*args)
+        return PostgresResponse(
+            model=cls, pre_query=pre_query, query=query, is_array=True
+        )
+
+    @classmethod
+    def filter_by_all_system(cls: Type[T], db: Session, **kwargs) -> PostgresResponse:
+        """
+        Filter multiple records by keyword arguments.
+
+        Args:
+            db: Database session
+            **kwargs: Filter criteria
+
+        Returns:
+            Query response with matching records
+        """
+        query = cls._query(db).filter_by(**kwargs)
+        return PostgresResponse(
+            model=cls, pre_query=cls._query(db), query=query, is_array=True
+        )

Services/PostgresService/controllers/mixin_controllers.py

@@ -0,0 +1,135 @@
+import arrow
+from sqlalchemy import (
+    TIMESTAMP,
+    func,
+    text,
+    UUID,
+    String,
+    Integer,
+    Boolean,
+    SmallInteger,
+)
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy_mixins.serialize import SerializeMixin
+from sqlalchemy_mixins.repr import ReprMixin
+from sqlalchemy_mixins.smartquery import SmartQueryMixin
+
+from Services.PostgresService.controllers.core_controllers import BaseAlchemyModel
+from Services.PostgresService.controllers.crud_controllers import CRUDModel
+from Services.PostgresService.controllers.filter_controllers import QueryModel
+from Services.PostgresService.database import Base
+
+
+class BasicMixin(
+    Base,
+    BaseAlchemyModel,
+    CRUDModel,
+    SerializeMixin,
+    ReprMixin,
+    SmartQueryMixin,
+    QueryModel,
+):
+
+    __abstract__ = True
+    __repr__ = ReprMixin.__repr__
+
+
+class CrudMixin(BasicMixin):
+    """
+    Base mixin providing CRUD operations and common fields for PostgreSQL models.
+
+    Features:
+    - Automatic timestamps (created_at, updated_at)
+    - Soft delete capability
+    - User tracking (created_by, updated_by)
+    - Data serialization
+    - Multi-language support
+    """
+
+    __abstract__ = True
+
+    # Primary and reference fields
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    uu_id: Mapped[str] = mapped_column(
+        UUID,
+        server_default=text("gen_random_uuid()"),
+        index=True,
+        unique=True,
+        comment="Unique identifier UUID",
+    )
+
+    # Common timestamp fields for all models
+    expiry_starts: Mapped[TIMESTAMP] = mapped_column(
+        TIMESTAMP(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+        comment="Record validity start timestamp",
+    )
+    expiry_ends: Mapped[TIMESTAMP] = mapped_column(
+        TIMESTAMP(timezone=True),
+        default=str(arrow.get("2099-12-31")),
+        server_default=func.now(),
+        comment="Record validity end timestamp",
+    )
+
+
+class CrudCollection(CrudMixin):
+    """
+    Full-featured model class with all common fields.
+
+    Includes:
+    - UUID and reference ID
+    - Timestamps
+    - User tracking
+    - Confirmation status
+    - Soft delete
+    - Notification flags
+    """
+
+    __abstract__ = True
+    __repr__ = ReprMixin.__repr__
+
+    ref_id: Mapped[str] = mapped_column(
+        String(100), nullable=True, index=True, comment="External reference ID"
+    )
+
+    # Timestamps
+    created_at: Mapped[TIMESTAMP] = mapped_column(
+        TIMESTAMP(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+        index=True,
+        comment="Record creation timestamp",
+    )
+    updated_at: Mapped[TIMESTAMP] = mapped_column(
+        TIMESTAMP(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+        index=True,
+        comment="Last update timestamp",
+    )
+
+    created_by: Mapped[str] = mapped_column(
+        String, nullable=True, comment="Creator name"
+    )
+    created_by_id: Mapped[int] = mapped_column(
+        Integer, nullable=True, comment="Creator ID"
+    )
+    updated_by: Mapped[str] = mapped_column(
+        String, nullable=True, comment="Last modifier name"
+    )
+    updated_by_id: Mapped[int] = mapped_column(
+        Integer, nullable=True, comment="Last modifier ID"
+    )
+
+    # Status flags
+    replication_id: Mapped[int] = mapped_column(
+        SmallInteger, server_default="0", comment="Replication identifier"
+    )
+    deleted: Mapped[bool] = mapped_column(
+        Boolean, server_default="0", comment="Soft delete flag"
+    )
+    active: Mapped[bool] = mapped_column(
+        Boolean, server_default="1", comment="Record active status"
+    )

Services/PostgresService/controllers/pagination_controllers.py

@@ -0,0 +1,249 @@
+from __future__ import annotations
+from typing import Any, Dict, Optional, Union
+from sqlalchemy import desc, asc
+from pydantic import BaseModel
+
+# from application.validations.request.list_options.list_options import ListOptions
+from Services.PostgresService.controllers.response_controllers import PostgresResponse
+from Configs.api import ApiConfigs
+
+
+class ListOptions:
+    ...
+
+
+class PaginationConfig(BaseModel):
+    """
+    Configuration for pagination settings.
+
+    Attributes:
+        page: Current page number (default: 1)
+        size: Items per page (default: 10)
+        order_field: Field to order by (default: "id")
+        order_type: Order direction (default: "asc")
+    """
+
+    page: int = 1
+    size: int = 10
+    order_field: Optional[Union[tuple[str], list[str]]] = None
+    order_type: Optional[Union[tuple[str], list[str]]] = None
+
+    def __init__(self, **data):
+        super().__init__(**data)
+        if self.order_field is None:
+            self.order_field = ["uu_id"]
+        if self.order_type is None:
+            self.order_type = ["asc"]
+
+
+class Pagination:
+    """
+    Handles pagination logic for query results.
+
+    Manages page size, current page, ordering, and calculates total pages
+    and items based on the data source.
+
+    Attributes:
+        DEFAULT_SIZE: Default number of items per page
+        MIN_SIZE: Minimum allowed page size
+        MAX_SIZE: Maximum allowed page size
+    """
+
+    DEFAULT_SIZE: int = int(ApiConfigs.DEFAULT_SIZE or 10)
+    MIN_SIZE: int = int(ApiConfigs.MIN_SIZE or 5)
+    MAX_SIZE: int = int(ApiConfigs.MAX_SIZE or 50)
+
+    def __init__(self, data: PostgresResponse):
+        self._data = data
+        self.size: int = self.DEFAULT_SIZE
+        self.page: int = 1
+        self.orderField: Optional[Union[tuple[str], list[str]]] = ["uu_id"]
+        self.orderType: Optional[Union[tuple[str], list[str]]] = ["asc"]
+        self.page_count: int = 1
+        self.total_pages: int = 1
+        self.total_count: int = self._data.count
+        self.all_count: int = self._data.total_count
+        self._update_page_counts()
+
+    def change(self, config: PaginationConfig) -> None:
+        """Update pagination settings from config."""
+        self.size = (
+            config.size
+            if self.MIN_SIZE <= config.size <= self.MAX_SIZE
+            else self.DEFAULT_SIZE
+        )
+        self.page = config.page
+        self.orderField = config.order_field
+        self.orderType = config.order_type
+        self._update_page_counts()
+
+    def feed(self, data: PostgresResponse) -> None:
+        """Calculate pagination based on data source."""
+        self._data = data
+        self._update_page_counts()
+
+    def _update_page_counts(self) -> None:
+        """Update page counts and validate current page."""
+        self.total_count = self._data.count
+        self.all_count = self._data.total_count
+
+        self.size = (
+            self.size
+            if self.MIN_SIZE <= self.size <= self.MAX_SIZE
+            else self.DEFAULT_SIZE
+        )
+        self.total_pages = max(1, (self.total_count + self.size - 1) // self.size)
+        self.page = max(1, min(self.page, self.total_pages))
+        self.page_count = (
+            self.total_count % self.size
+            if self.page == self.total_pages and self.total_count % self.size
+            else self.size
+        )
+
+    def refresh(self) -> None:
+        """Reset pagination state to defaults."""
+        self._update_page_counts()
+
+    def reset(self) -> None:
+        """Reset pagination state to defaults."""
+        self.size = self.DEFAULT_SIZE
+        self.page = 1
+        self.orderField = "uu_id"
+        self.orderType = "asc"
+
+    def as_dict(self) -> Dict[str, Any]:
+        """Convert pagination state to dictionary format."""
+        self.refresh()
+        return {
+            "size": self.size,
+            "page": self.page,
+            "allCount": self.all_count,
+            "totalCount": self.total_count,
+            "totalPages": self.total_pages,
+            "pageCount": self.page_count,
+            "orderField": self.orderField,
+            "orderType": self.orderType,
+        }
+
+
+class PaginationResult:
+    """
+    Result of a paginated query.
+
+    Contains the query result and pagination state.
+    data: PostgresResponse of query results
+    pagination: Pagination state
+
+    Attributes:
+        _query: Original query object
+        pagination: Pagination state
+    """
+
+    def __init__(
+        self, data: PostgresResponse, pagination: Pagination, response_model: Any = None
+    ):
+        self._data = data
+        self._query = data.query
+        self._core_query = data.core_query
+        self.pagination = pagination
+        self.response_type = data.is_list
+        self.limit = self.pagination.size
+        self.offset = self.pagination.size * (self.pagination.page - 1)
+        self.order_by = self.pagination.orderField
+        self.order_type = self.pagination.orderType
+        self.response_model = response_model
+
+    def dynamic_order_by(self):
+        """
+        Dynamically order a query by multiple fields.
+        Returns:
+            Ordered query object.
+        """
+        if not len(self.order_by) == len(self.order_type):
+            raise ValueError(
+                "Order by fields and order types must have the same length."
+            )
+        order_criteria = zip(self.order_by, self.order_type)
+        print('order_criteria', order_criteria)
+        if not self._data.data:
+            return self._core_query
+
+        for field, direction in order_criteria:
+            print('field', field, direction)
+            columns = self._data.data[0].filterable_attributes
+            print('columns', columns)
+            if field in columns:
+                if direction.lower().startswith("d"):
+                    self._core_query = self._core_query.order_by(
+                        desc(
+                            getattr(self._core_query.column_descriptions[0]["entity"], field)
+                        )
+                    )
+                else:
+                    self._core_query = self._core_query.order_by(
+                        asc(
+                            getattr(self._core_query.column_descriptions[0]["entity"], field)
+                        )
+                    )
+        return self._core_query
+
+    @property
+    def data(self) -> Union[list | dict]:
+        """Get query object."""
+        query_ordered = self.dynamic_order_by()
+        query_paginated = query_ordered.limit(self.limit).offset(self.offset)
+        queried_data = (
+            query_paginated.all() if self.response_type else query_paginated.first()
+        )
+        data = (
+            [result.get_dict() for result in queried_data]
+            if self.response_type
+            else queried_data.get_dict()
+        )
+        if self.response_model:
+            return [self.response_model(**item).model_dump() for item in data]
+        return data
+
+
+class QueryOptions:
+
+    def __init__(
+        self,
+        table,
+        data: Union[dict, ListOptions] = None,
+        model_query: Optional[Any] = None,
+    ):
+        self.table = table
+        self.data = data
+        self.model_query = model_query
+        if isinstance(data, dict):
+            self.data = ListOptions(**data)
+        self.validate_query()
+        if not self.data.order_type:
+            self.data.order_type = ["created_at"]
+        if not self.data.order_field:
+            self.data.order_field = ["uu_id"]
+
+    def validate_query(self):
+        if not self.data.query or not self.model_query:
+            return ()
+        cleaned_query, cleaned_query_by_model, last_dict = {}, {}, {}
+        for key, value in self.data.query.items():
+            cleaned_query[str(str(key).split("__")[0])] = value
+            cleaned_query_by_model[str(str(key).split("__")[0])] = (key, value)
+        cleaned_model = self.model_query(**cleaned_query)
+        for i in cleaned_query:
+            if hasattr(cleaned_model, i):
+                last_dict[str(cleaned_query_by_model[str(i)][0])] = str(
+                    cleaned_query_by_model[str(i)][1]
+                )
+        self.data.query = last_dict
+
+    def convert(self) -> tuple:
+        """
+        self.table.convert(query)
+        (<sqlalchemy.sql.elements.BinaryExpression object at 0x7caaeacf0080>, <sqlalchemy.sql.elements.BinaryExpression object at 0x7caaea729b80>)
+        """
+        if not self.data or self.data.query:
+            return ()
+        return tuple(self.table.convert(self.data.query))

Services/PostgresService/controllers/response_controllers.py

@@ -0,0 +1,109 @@
+"""
+Response handler for PostgreSQL query results.
+
+This module provides a wrapper class for SQLAlchemy query results,
+adding convenience methods for accessing data and managing query state.
+"""
+
+from typing import Any, Dict, Optional, TypeVar, Generic, Union
+from sqlalchemy.orm import Query
+
+
+T = TypeVar("T")
+
+
+class PostgresResponse(Generic[T]):
+    """
+    Wrapper for PostgreSQL/SQLAlchemy query results.
+
+    Attributes:
+        metadata: Additional metadata for the query
+
+    Properties:
+        count: Total count of results
+        query: Get query object
+        as_dict: Convert response to dictionary format
+    """
+
+    def __init__(
+        self,
+        pre_query: Query,
+        query: Query,
+        model,
+        is_array: bool = True,
+        metadata: Any = None,
+    ):
+        self._core_class = model
+        self._is_list = is_array
+        self._query = query
+        self._pre_query = pre_query
+        self._count: Optional[int] = None
+        self.metadata = metadata
+
+    @property
+    def core_class(self):
+        """Get query object."""
+        return self._core_class
+
+    @property
+    def data(self) -> Union[T, list[T]]:
+        """Get query results."""
+        if not self.is_list:
+            first_item = self._query.first()
+            return first_item if first_item else None
+        return self._query.all() if self._query.all() else []
+
+    @property
+    def data_as_dict(self) -> Union[Dict[str, Any], list[Dict[str, Any]]] | None:
+        """Get query results as dictionary."""
+        if not self.count:
+            return None
+        if self.is_list:
+            first_item = self._query.first()
+            return first_item.get_dict() if first_item.first() else None
+        all_items = self._query.all()
+        return [result.get_dict() for result in all_items] if all_items else []
+
+    @property
+    def total_count(self) -> int:
+        """Lazy load and return total count of results."""
+        return self._pre_query.count() if self._pre_query else 0
+
+    @property
+    def count(self) -> int:
+        """Lazy load and return total count of results."""
+        return self._query.count()
+
+    @property
+    def query(self) -> str:
+        """Get query object."""
+        return str(self._query)
+
+    @property
+    def core_query(self) -> Query:
+        """Get query object."""
+        return self._query
+
+    @property
+    def is_list(self) -> bool:
+        """Check if response is a list."""
+        return self._is_list
+
+    @property
+    def as_dict(self) -> Dict[str, Any]:
+        """Convert response to dictionary format."""
+        if isinstance(self.data, list):
+            return {
+                "metadata": self.metadata,
+                "is_list": self._is_list,
+                "query": str(self.query),
+                "count": self.count,
+                "data": [result.get_dict() for result in self.data],
+            }
+        return {
+            "metadata": self.metadata,
+            "is_list": self._is_list,
+            "query": str(self.query),
+            "count": self.count,
+            "data": self.data.get_dict() if self.data else {},
+        }

Services/PostgresService/database.py

@@ -0,0 +1,62 @@
+from contextlib import contextmanager
+from functools import lru_cache
+from typing import Generator
+
+from Configs.postgres import Database
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import declarative_base, sessionmaker, scoped_session, Session
+
+
+# Configure the database engine with proper pooling
+engine = create_engine(
+    Database.DATABASE_URL,
+    pool_pre_ping=True,  # Verify connection before using
+    pool_size=20,  # Maximum number of permanent connections
+    max_overflow=10,  # Maximum number of additional connections
+    pool_recycle=3600,  # Recycle connections after 1 hour
+    pool_timeout=30,  # Wait up to 30 seconds for a connection
+    echo=True,  # Set to True for debugging SQL queries
+)
+
+Base = declarative_base()
+
+
+# Create a cached session factory
+@lru_cache()
+def get_session_factory() -> scoped_session:
+    """Create a thread-safe session factory."""
+    session_local = sessionmaker(
+        bind=engine,
+        autocommit=False,
+        autoflush=False,
+        expire_on_commit=False,  # Prevent expired object issues
+    )
+    return scoped_session(session_local)
+
+
+# Get database session with proper connection management
+@contextmanager
+def get_db() -> Generator[Session, None, None]:
+    """Get database session with proper connection management.
+
+    This context manager ensures:
+    - Proper connection pooling
+    - Session cleanup
+    - Connection return to pool
+    - Thread safety
+
+    Yields:
+        Session: SQLAlchemy session object
+    """
+    session_factory = get_session_factory()
+    session = session_factory()
+    try:
+        yield session
+        session.commit()
+    except Exception:
+        session.rollback()
+        raise
+    finally:
+        session.close()
+        session_factory.remove()  # Clean up the session from the registry