book_library_server/fastapi_book_server/app/services/sequence.py

from app.models import Sequence
from app.services.common import TRGMSearchService, GetRandomService


GET_OBJECT_IDS_QUERY = """
SELECT ARRAY (
    WITH filtered_sequences AS (
        SELECT
            id,
            similarity(name, :query) as sml,
            (
                SELECT count(*) FROM book_sequences
                LEFT JOIN books ON (books.id = book AND books.is_deleted = 'f')
                WHERE sequence = sequences.id
            ) as books_count
        FROM sequences
        WHERE name % :query AND
        EXISTS (
            SELECT * FROM book_sequences
            LEFT JOIN books ON (books.id = book AND books.is_deleted = 'f')
            WHERE sequence = sequences.id
        )
    )
    SELECT fsequences.id FROM filtered_sequences as fsequences
    ORDER BY fsequences.sml DESC, fsequences.books_count DESC
    LIMIT 210
);
"""


class SequenceTGRMSearchService(TRGMSearchService):
    MODEL_CLASS = Sequence
    PREFETCH_RELATED = ["source"]
    GET_OBJECT_IDS_QUERY = GET_OBJECT_IDS_QUERY


class GetRandomSequenceService(GetRandomService):
    MODEL_CLASS = Sequence