book_library_server/fastapi_book_server/app/services/author.py

from app.models import Author

from app.services.common import TRGMSearchService, GetRandomService


GET_OBJECT_IDS_QUERY = """
SELECT ARRAY(
    WITH filtered_authors AS ( 
        SELECT 
            id,
            GREATEST(
                similarity((last_name || ' ' || first_name || ' ' || middle_name), :query),
                similarity((last_name || ' ' || first_name), :query),
                similarity((last_name), :query)
            ) as sml,
            (
                SELECT count(*) FROM book_authors
                LEFT JOIN books ON (books.id = book AND books.is_deleted = 'f')
                WHERE author = authors.id
            ) as books_count
        FROM authors
        WHERE (
            (last_name || ' ' || first_name || ' ' || middle_name) % :query OR
            (last_name || ' ' || first_name) % :query OR
            (last_name) % :query
        ) AND
        EXISTS (
            SELECT * FROM book_authors
            LEFT JOIN books ON (books.id = book AND books.is_deleted = 'f')
            WHERE author = authors.id 
        )
    )
    SELECT fauthors.id FROM filtered_authors as fauthors
    ORDER BY fauthors.sml DESC, fauthors.books_count DESC
    LIMIT 210
);
"""


class AuthorTGRMSearchService(TRGMSearchService):
    MODEL_CLASS = Author
    PREFETCH_RELATED = ["source", "annotations"]
    GET_OBJECT_IDS_QUERY = GET_OBJECT_IDS_QUERY


class GetRandomAuthorService(GetRandomService):
    MODEL_CLASS = Author