Data too long for column 'img' where img is a LargeBinary - flask

Question

I have the following model:
from marshmallow import Schema, fields
from server import db, ma, app
from sqlalchemy.ext.hybrid import hybrid_property
from .analysis import AnalysisSchema
class Category(db.Model):
__tablename__ = 'Categories'
__table_args__ = {'extend_existing': True}
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(120), index=True, unique=True)
description = db.Column(db.Text, nullable=False)
img = db.Column(db.LargeBinary, nullable=False)
img_mimetype = db.Column(db.Text, nullable=False)
img_name = db.Column(db.Text, nullable=False)
analysis = db.relationship("Analysis", back_populates="category")
#property
def img_url(self):
return "/categories/" + str(self.id)
class CategorySchema(ma.SQLAlchemyAutoSchema):
class Meta:
# model = Category
fields = ("id", "name", "description", "img", "img_url", "analysis")
analysis = fields.Nested(AnalysisSchema, many=True)
class CreateCategorySchema(Schema):
name = fields.Str(required=True)
description = fields.Str(required=True)
class UpdateCategorySchema(Schema):
name = fields.Str(required=True)
description = fields.Str(required=False)
img_name = fields.Str(required=False)
img_mimetype = fields.Str(required=False)
I create a new category with the following code:
from flask import jsonify
from server import db, app
from ..models.category import (
Category,
CategorySchema,
CreateCategorySchema,
UpdateCategorySchema
)
def create_category(data):
app.logger.info('Create category invoked')
create_category_schema = CreateCategorySchema()
# errors = create_category_schema.validate(data)
errors = None
if errors:
app.logger.info('Found errors %s', errors)
return jsonify(errors), 400
name = Category.query.filter_by(name=data['name']).first()
app.logger.info('Name is %s', name)
if not name:
app.logger.info('Name not present')
category = Category(
name=data['name'],
description=data['description'],
img=data['img'],
img_name=data['img_name'],
img_mimetype=data['img_mimetype']
)
_save_category(category)
category_schema = CategorySchema()
response = category_schema.dump(category), 201
#response = jsonify('Category created'), 200
else:
response = jsonify('Category already exists'), 409
return response
def all_categories():
category_schema = CategorySchema(many=True, exclude=['img'])
categories = Category.query.all()
response = category_schema.dump(categories)
return jsonify(response), 20
def get_category(id):
return Category.query.filter_by(id=id).first()
def _save_category(category):
db.session.add(category)
db.session.commit()
If I try to invoke create_category I got the following error:
sqlalchemy.exc.DataError: (MySQLdb._exceptions.DataError) (1406, "Data too long for column 'img' at row 1")
[SQL: INSERT INTO `Categories` (name, description, img, img_mimetype, img_name) VALUES (%s, %s, %s, %s, %s)]
[parameters: ('test10', 'blah blah blah', b'\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x84\x00\x06\x06\x06\x06\x07\x06\x07\x08\x08\x07\n\x0b\n\x0b\n\x0f\x ... (371140 characters truncated) ... xe4\xd3\xc0\xe3\xcag\xaf\x17\xff\x00\xcc?\xfdD\xfe\x85\xc3\x91\x06\x07\x017#3\x93:\x7fE\xfe\xb3\xff\x00\xe9_\xff\x00\x04r-i\x86\xb7\xd6|#\xbf\xff\xd9', 'image/jpeg', 'WhatsApp_Image_2021-06-04_at_11.14.49_AM.jpeg')]
(Background on this error at: http://sqlalche.me/e/14/9h9h)
I don't understand why is trying to insert an image as a String if it is explicitly defined as a LargeBinary.

Answer 1

The solution can be found in the question comments. I had to increase the size of the Blob using the length attribute of SQLAlchemy.