61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
"""Create post use case."""
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from app.application.dtos.post import CreatePostDTO, PostResponseDTO
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from app.application.interfaces import TransactionManager
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from app.domain.entities import Post
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from app.domain.exceptions import AlreadyExistsException
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from app.domain.repositories import PostRepository
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class CreatePostUseCase:
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"""Use case for creating a new blog post."""
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def __init__(
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self,
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post_repo: PostRepository,
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tx_manager: TransactionManager,
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) -> None:
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self._post_repo = post_repo
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self._tx_manager = tx_manager
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async def execute(self, dto: CreatePostDTO) -> PostResponseDTO:
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"""Execute the use case."""
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# Generate slug from title
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from app.domain.value_objects import Slug
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slug = Slug.from_title(dto.title)
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# Check if slug already exists
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if await self._post_repo.slug_exists(slug.value):
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raise AlreadyExistsException(f"Post with slug '{slug.value}' already exists")
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# Create domain entity
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post = Post.create(
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title_str=dto.title,
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content_str=dto.content,
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author_id=dto.author_id,
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tags=dto.tags or [],
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)
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# Persist entity
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await self._post_repo.add(post)
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# Commit transaction
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await self._tx_manager.commit()
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return self._map_to_dto(post)
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def _map_to_dto(self, post: Post) -> PostResponseDTO:
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"""Map domain entity to response DTO."""
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return PostResponseDTO(
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id=post.id,
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title=post.title.value,
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content=post.content.value,
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slug=post.slug.value,
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author_id=post.author_id,
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published=post.published,
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tags=post.tags.copy(),
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created_at=post.created_at,
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updated_at=post.updated_at,
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)
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