sqlalchemy.exc.InvalidRequestError: Table is already defined for this MetaData instance. Specify 'extend_existing=True' t
#I had a similar error.
#My problem was importing the class that inherits db.Model from two different files using a relative import.
#Flask-SQLAlchemy mapped the two imports as two different table definitions and tried to create two tables.
#I fixed this issue by using the absolute import path in both files.
#BEFORE fix, the imports looked like this:
#Import 1:
models_dir = (os.path.abspath(os.path.join(os.path.dirname(__file__) + '/models/')))
sys.path.append(models_dir)
from models import VideoFileModel # Import table
#Import 2(In other file):
from app.models.models import VideoFileModel
# AFTER FIX
#Import 1:
from app.models.models import VideoFileModel # Import table
#Import 2(In other file):
from app.models.models import VideoFileModel