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blog.pyaqa.ru/app/application/use_cases/list_comments.py
Sergey Vanyushkin 7ff3fa0992
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feat: add comments feature with nested replies and recursive rendering
Implement full comments system: domain entities (Comment, CommentLike),
value objects (CommentContent), use cases (CRUD, like toggle), SQLAlchemy
repository, API v1 endpoints, web UI with comment form and nested replies,
i18n translations (EN/RU/FR/DE), and E2E tests.

Fix nested reply (reply-to-reply) not displaying — the flat reply_comments
dict was only queried for top-level comment IDs, so deeply nested replies
were saved to DB (incrementing comment count) but never rendered. Switch
to a recursive Jinja2 macro that renders any nesting depth.
2026-05-11 15:34:20 +03:00

64 lines
1.8 KiB
Python

"""List comments use case.
This module implements the use case for listing comments on a blog post.
"""
from uuid import UUID
from app.application.dtos.comment import CommentResponseDTO
from app.domain.entities.comment import Comment
from app.domain.repositories import CommentRepository
class ListCommentsUseCase:
"""Use case for listing comments on a blog post.
Retrieves all comments for a given post ordered by creation time.
Attributes:
_comment_repo: Repository for comment data access.
"""
def __init__(
self,
comment_repo: CommentRepository,
) -> None:
"""Initialize use case with dependencies.
Args:
comment_repo: Repository for comment operations.
"""
self._comment_repo = comment_repo
async def execute(self, post_id: UUID) -> list[CommentResponseDTO]:
"""List all comments for a post.
Args:
post_id: UUID of the post.
Returns:
List of CommentResponseDTO for the post.
"""
comments = await self._comment_repo.get_by_post(post_id)
return [self._map_to_dto(c) for c in comments]
def _map_to_dto(self, comment: Comment) -> CommentResponseDTO:
"""Map domain entity to response DTO.
Args:
comment: Domain Comment entity.
Returns:
CommentResponseDTO with all comment attributes.
"""
return CommentResponseDTO(
id=comment.id,
post_id=comment.post_id,
author_id=comment.author_id,
content=comment.content.value,
parent_id=comment.parent_id,
like_count=comment.like_count,
created_at=comment.created_at,
updated_at=comment.updated_at,
)