Im creating tables using sqlalchemy and some of these tables has more than one foreign key relationship.Below is the code. I'm getting error:

> 
> sqlalchemy.exc.NoForeignKeysError: Can't find any foreign key
>  relationships between 'project' and 'genre'
> 
> 
> 

when try to run the script.

Could anyone explain me how tables are created in sqlalchemy, order of the creation if there are tables with more than one relation.

```
   import sqlalchemy
   from  sqlalchemy.orm import *
   from sqlalchemy.ext.declarative import declarative_base
   import datetime
   from sqlalchemy import *

   engine =               sqlalchemy.create_engine('postgresql+psycopg2://postgres:newpassword@localhost:5432/test');

   Session = sessionmaker(bind=engine)

   session = Session()

   metadata = MetaData(engine)

   metadata.drop_all(engine)

   Base = declarative_base(metadata=metadata)

   class User(Base):
        __tablename__ = 'users'
        id = Column(Integer,primary_key = True)
        email = Column(String(30),nullable = False)
        password = Column(String(30),nullable = False)

   class Genre(Base):
        __tablename__ = 'genre'
        id = Column(Integer,primary_key = True)
        title = Column(String(30),nullable = False)

   class Status(Base):
        __tablename__ = 'status'
        id = Column(Integer,primary_key = True)
        status = Column(String(30),nullable = False)

   class FilmType(Base):
        __tablename__ = 'filmtype'
        id = Column(Integer,primary_key = True)
        filmtype = Column(String(30),nullable = False)

   class Project(Base):
        __tablename__ = 'project'
        id = Column(Integer,primary_key = True)
        name = Column(String(30),nullable = False)
        poster = Column(Text, nullable = False)
        genre_id = Column(Integer,ForeignKey('genre.id'))
        genre_id = relationship('Genre',backref = 'genres')
        owner = Column(Integer,ForeignKey('users.id'))
        owner = relationship('Users',backref = 'users')

   class Videos(Base):
         __tablename__ = 'videos'
         id = Column(Integer,primary_key = True)
         dropbox_url = Column(Text)
         film_type = Column(Integer,ForeignKey('filmtype.id'))
         film_type = relationship('FilmType',backref = 'film_types')
         video_status = Column(Integer,ForeignKey('status.id'))
         video_status = relationship('Status',backref = 'video_statuses')
         project_id = Column(Integer,ForeignKey('project.id'))
         project_id = relationship('Project',backref = 'projetcs')
         user_id = Column(Integer,ForeignKey('users.id'))
         user_id = relationship('User', backref = 'video_owners')

  metadata.create_all(bind = engine)
  user_ = User(email='lala.com',password='lala')
  genre_ = Genre(title='Horror')
  status_ = Status(status='Active')
  filmtype_ = FilmType(filmtype ='lala')
  project_ = Project(name='lala',poster='mij.jpg')
  videos_ = Videos(dropbox_url='drop/vi.com')
  session.add(videos_)
  session.flush()
  session.commit()

```

**Error**

> 
> "sqlalchemy.exc.NoForeignKeysError: Could not determine join condition > between parent/child tables on relationship Project.genre\_id - there are no foreign keys linking these tables. Ensure that referencing columns are associated with a ForeignKey or ForeignKeyConstraint, or specify a 'primaryjoin' expression."
> 
> 
>