103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
from typing import Any, Dict, List, Union, Protocol
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from dataclasses import dataclass
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from sqlalchemy.orm import Query
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from Services.PostgresDb.Models.response import PostgresResponse
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class DataValidator(Protocol):
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"""Protocol for data validation methods."""
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@staticmethod
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def validate_data(data: Any, cls_object: Any) -> None:
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"""Validate data and raise HTTPExceptionApi if invalid."""
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...
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@dataclass
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class PaginationConfig:
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"""
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Configuration for pagination settings.
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Attributes:
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page: Current page number (default: 1)
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size: Items per page (default: 10)
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order_field: Field to order by (default: "id")
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order_type: Order direction (default: "asc")
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"""
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page: int = 1
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size: int = 10
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order_field: str = "id"
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order_type: str = "asc"
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class Pagination:
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"""
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Handles pagination logic for query results.
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Manages page size, current page, ordering, and calculates total pages
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and items based on the data source.
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Attributes:
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DEFAULT_SIZE: Default number of items per page (10)
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MIN_SIZE: Minimum allowed page size (10)
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MAX_SIZE: Maximum allowed page size (40)
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"""
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DEFAULT_SIZE = 10
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MIN_SIZE = 10
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MAX_SIZE = 40
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def __init__(self):
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self.size: int = self.DEFAULT_SIZE
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self.page: int = 1
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self.order_field: str = "id"
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self.order_type: str = "asc"
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self.page_count: int = 1
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self.total_count: int = 0
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self.total_pages: int = 1
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def change(self, config: PaginationConfig) -> None:
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"""Update pagination settings from config."""
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self.size = (
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config.size
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if self.MIN_SIZE <= config.size <= self.MAX_SIZE
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else self.DEFAULT_SIZE
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)
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self.page = config.page
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self.order_field = config.order_field
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self.order_type = config.order_type
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self._update_page_counts()
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def feed(self, data: Union[List[Any], PostgresResponse, Query]) -> None:
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"""Calculate pagination based on data source."""
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self.total_count = (
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len(data)
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if isinstance(data, list)
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else data.count if isinstance(data, PostgresResponse) else data.count()
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)
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self._update_page_counts()
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def _update_page_counts(self) -> None:
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"""Update page counts and validate current page."""
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self.total_pages = max(1, (self.total_count + self.size - 1) // self.size)
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self.page = max(1, min(self.page, self.total_pages))
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self.page_count = (
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self.total_count % self.size
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if self.page == self.total_pages and self.total_count % self.size
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else self.size
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)
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def as_dict(self) -> Dict[str, Any]:
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"""Convert pagination state to dictionary format."""
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return {
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"size": self.size,
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"page": self.page,
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"totalCount": self.total_count,
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"totalPages": self.total_pages,
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"pageCount": self.page_count,
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"orderField": self.order_field,
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"orderType": self.order_type,
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}
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