SQLAlchemy ORM check if column is a foreign_key

Question

Hi I was wondering if anyone knows of the most efficient way to find out if a column has a foreignKey relationship or not.

Answer 1

I had a similar problem. Actually I didn't have the table object, but the table name, and similarly the column name. Here is my solution:

from sqlalchemy.schema import MetaData
from sqlalchemy import create_engine

engine = create_engine( URL )
meta = MetaData()
meta.reflect(bind=engine)

def is_foreign_key(table_name, col_name):
    return col_name in [e.target_fullname for e in meta.tables[table_name].foreign_keys]

NOTE:

meta.tables[table_name].foreign_keys == Table.__table__.foreign_keys