Flask-Pydantic disable validation on get request - flask

Question

I have a flask view that accepts a get and post request and I use Pydantic for request body validation using flask-pydantic. It works fine for post requests but on get requests it returns a 415 error with this message -
{"detail":"Unsupported media type '' in request. 'application/json' is required."}
#bp.route('/login', methods=('GET', 'POST',))
#validate()
def login(body: UserLoginSchema):
if request.method == 'POST':
existing_user = UserListSchema.from_orm(
db_session.query(UserModel.id, UserModel.email, UserModel.first_name, UserModel.last_name,
UserModel.is_admin, UserModel.is_verified, UserModel.password)
.filter_by(email=body.email, is_active=True).first()
)
if existing_user:
if check_password_hash(existing_user.password, body.password):
session.clear()
session['user'] = str(existing_user.json())
return redirect(url_for('index'))
flash('Invalid username or password')
return render_template('auth/login.html')
I have tried setting the query parameter in the function to an empty string or None and it doesn't help.

Answer 1

I removed the flask-pydantic package and initialised the pydantic models manually because the validate decorator from flask-pydantic requires the content-type header to be set to application/json.
#bp.route('/login', methods=('GET', 'POST',))
def login():
if request.method == 'POST':
body = auth_schemas.UserLoginSchema(**request.form)
existing_user = auth_schemas.UserListSchema.from_orm(
db_session.query(UserModel.id, UserModel.email, UserModel.first_name, UserModel.last_name,
UserModel.is_admin, UserModel.is_verified, UserModel.password)
.filter_by(email=body.email, is_active=True).first()
)
if existing_user:
if check_password_hash(existing_user.password, body.password):
session.clear()
session['user'] = str(existing_user.json())
return redirect(url_for('index'))
flash('Invalid username or password')
return render_template('auth/login.html')
Then I created a ValidationError handler to catch validation errors while initializing the pydantic model classs.
from pydantic import ValidationError
#app.errorhandler(ValidationError)
def handle_pydantic_validation_errors(e):
return jsonify(e.errors())