system-pri/backend/app/project_supervisor/models.py

from ..dependencies import db
from ..base.models import Person, Base
from flask_sqlalchemy import BaseQuery

from sqlalchemy import or_
from sqlalchemy.sql import text
from ..base.utils import order_by_column_name

class ProjectSupervisor(Base, Person):
    __tablename__ = "project_supervisors"

    limit_group = db.Column(db.Integer, default=3, nullable=False)
    count_groups = db.Column(db.Integer, default=0, nullable=False)
    mode = db.Column(db.Integer, default=0, nullable=False)  # 0 - stationary, 1 - non-stationary, 2 - both

    @classmethod
    def search_by_fullname_and_mode_and_order_by_first_name_or_last_name(cls, fullname: str = None,
                                                                         mode: int = None,
                                                                         order_by_first_name: str = None,
                                                                         order_by_last_name: str = None) -> BaseQuery:
        project_supervisors_query = cls.query

        if mode is not None:
            project_supervisors_query = project_supervisors_query.filter(mode != 1-mode)

        if fullname is not None:
            """This works only for sqlite3 database - concat function  doesn't exist so i used builtin concat 
            operator specific only for sqlite db - || """
            project_supervisors_query = project_supervisors_query.filter(
                text("project_supervisorss_first_name || ' ' || project_supervisorss_last_name LIKE :fullname ")
            ).params(fullname=f'{fullname}%')

        project_supervisors_query = order_by_column_name(project_supervisors_query, ProjectSupervisor.first_name, order_by_first_name)
        project_supervisors_query = order_by_column_name(project_supervisors_query, ProjectSupervisor.last_name, order_by_last_name)

        return project_supervisors_query