CODEWITHSUNDEEP
pythonmarshmallow
Gilbert
Gilbert

Reputation: 493

Load PATCH data with Marshmallow without validating missing fields

I'm trying to implement a PATCH route for the following SQLAlchemy model and Marshmallow-SQLAlchemy schema. I want to update description, address, or both. When I send the only one field in the data and try to load it, Marshmallow says the other field is missing. How can I load patch data with Marshmallow without it validating missing fields?

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), nullable=False, unique=True)
    password = db.Column(db.String(80))
    description = db.Column(db.String(180))
    address = db.Column(db.String(180))


class UserSchema(ma.ModelSchema):
    class Meta:
        model = UserModel
        load_only = ("password",)
        dump_only = ("id",)

{
    "description": "New Description"
}

user_data = user_schema.load(request.get_json())

{
    "username": [
        "Missing data for required field."
    ]
}

Upvotes: 5

Views: 1920

Answers (1)

stasiekz
stasiekz

Reputation: 1863

Since it is PATCH you can pass your model instance and flag partial=True to the schema. 

user_data = user_schema.load(request.get_json(), instance=instance, partial=True)

Upvotes: 7

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