Update row (SQLAlchemy) with data from marshmallow

Update row (SQLAlchemy) with data from marshmallow

To update a row in a database using SQLAlchemy and data from Marshmallow, you can follow these steps:

  1. Define SQLAlchemy Model:

    Define your SQLAlchemy model class that represents the table you want to update.

  2. Create Marshmallow Schema:

    Create a Marshmallow schema to validate and deserialize the incoming data. You can also include fields for data you want to update.

  3. Retrieve Data and Update:

    Retrieve the existing row you want to update from the database, then load and validate the new data using the Marshmallow schema. Finally, update the retrieved object's attributes and commit the changes to the database.

Here's an example:

Assuming you have an SQLAlchemy model named User and a Marshmallow schema named UserSchema:

from sqlalchemy import create_engine, Column, Integer, String from sqlalchemy.orm import sessionmaker from sqlalchemy.ext.declarative import declarative_base from marshmallow import Schema, fields, ValidationError # SQLAlchemy Model Base = declarative_base() class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) username = Column(String) email = Column(String) # Marshmallow Schema class UserSchema(Schema): username = fields.String() email = fields.Email() # Update Function def update_user(session, user_id, update_data): user = session.query(User).get(user_id) if user: schema = UserSchema() try: validated_data = schema.load(update_data) for field, value in validated_data.items(): setattr(user, field, value) session.commit() print("User updated successfully!") except ValidationError as err: print("Validation error:", err.messages) else: print("User not found") # Main if __name__ == "__main__": engine = create_engine("sqlite:///example.db") Base.metadata.create_all(engine) Session = sessionmaker(bind=engine) session = Session() user_id_to_update = 1 new_data = {"username": "new_username", "email": "new_email@example.com"} update_user(session, user_id_to_update, new_data)

In this example, the update_user function retrieves an existing user based on the provided user_id, loads and validates the new data using the UserSchema, updates the user's attributes, and then commits the changes to the database. Validation errors are caught and displayed if the data doesn't match the schema.

Remember to customize the code according to your specific SQLAlchemy model, Marshmallow schema, and database configuration.

Examples

  1. How to update a row in SQLAlchemy with data from Marshmallow schema in Python

    • Description: This query is about updating a database row using SQLAlchemy ORM in Python, where the data comes from a Marshmallow schema.
    • Code:
      from your_module import db, YourModel, YourSchema # Load the existing row existing_row = db.session.query(YourModel).filter_by(id=1).first() # Deserialize data from Marshmallow schema schema = YourSchema() update_data = schema.load(your_data_dict) # Update the row with Marshmallow data for key, value in update_data.items(): setattr(existing_row, key, value) # Commit changes db.session.commit()

  2. Updating SQLAlchemy row with Marshmallow schema in Flask application

    • Description: This query focuses on updating a row in a SQLAlchemy-backed database within a Flask application using data validated by a Marshmallow schema.
    • Code:
      from flask import request from your_app import db, YourModel, YourSchema @app.route('/update', methods=['POST']) def update_row(): row_id = request.json.get('id') update_data = request.json.get('update_data') existing_row = db.session.query(YourModel).filter_by(id=row_id).first() if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) db.session.commit() return 'Row updated successfully', 200 else: return 'Row not found', 404

  3. How to update SQLAlchemy row with Marshmallow schema in Django project

    • Description: This query seeks guidance on updating a SQLAlchemy-managed row in a Django project, with data validated by a Marshmallow schema.
    • Code:
      from your_app.models import YourModel from your_app.schemas import YourSchema # Assuming you have a function or view where you receive the update data def update_row(row_id, update_data): existing_row = YourModel.query.get(row_id) if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) db.session.commit() return 'Row updated successfully' else: return 'Row not found'

  4. Update SQLAlchemy row using Marshmallow schema in Pyramid

    • Description: This query focuses on updating a SQLAlchemy row in a Pyramid application with data validated by a Marshmallow schema.
    • Code:
      from pyramid.view import view_config from your_app.models import YourModel from your_app.schemas import YourSchema @view_config(route_name='update_row', request_method='POST', renderer='json') def update_row(request): row_id = request.json_body.get('id') update_data = request.json_body.get('update_data') existing_row = request.dbsession.query(YourModel).filter_by(id=row_id).first() if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) request.dbsession.commit() return {'message': 'Row updated successfully'} else: return {'message': 'Row not found'}, 404

  5. How to update SQLAlchemy row with Marshmallow schema in FastAPI

    • Description: This query is about updating a SQLAlchemy-managed row in a FastAPI application, with data validated by a Marshmallow schema.
    • Code:
      from fastapi import FastAPI, HTTPException from your_module import db, YourModel, YourSchema app = FastAPI() @app.put("/update/{row_id}") async def update_row(row_id: int, update_data: dict): existing_row = db.query(YourModel).filter_by(id=row_id).first() if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) db.commit() return {"message": "Row updated successfully"} else: raise HTTPException(status_code=404, detail="Row not found")

  6. Updating SQLAlchemy row using Marshmallow schema in Falcon

    • Description: This query seeks guidance on updating a SQLAlchemy-managed row in a Falcon application, with data validated by a Marshmallow schema.
    • Code:
      import falcon from your_module import db, YourModel, YourSchema class UpdateResource: def on_put(self, req, resp, row_id): existing_row = db.query(YourModel).filter_by(id=row_id).first() if existing_row: schema = YourSchema() update_data = schema.load(req.media) for key, value in update_data.items(): setattr(existing_row, key, value) db.commit() resp.media = {'message': 'Row updated successfully'} resp.status = falcon.HTTP_200 else: resp.media = {'message': 'Row not found'} resp.status = falcon.HTTP_404 app = falcon.App() app.add_route('/update/{row_id}', UpdateResource())

  7. Update SQLAlchemy row with Marshmallow schema in Tornado

    • Description: This query focuses on updating a SQLAlchemy row in a Tornado application with data validated by a Marshmallow schema.
    • Code:
      import tornado.ioloop import tornado.web from your_module import db, YourModel, YourSchema class UpdateHandler(tornado.web.RequestHandler): def put(self, row_id): existing_row = db.query(YourModel).filter_by(id=row_id).first() if existing_row: schema = YourSchema() update_data = schema.load(self.request.body_arguments) for key, value in update_data.items(): setattr(existing_row, key, value) db.commit() self.write({'message': 'Row updated successfully'}) else: self.set_status(404) self.write({'message': 'Row not found'}) def make_app(): return tornado.web.Application([ (r"/update/([^/]+)", UpdateHandler), ]) if __name__ == "__main__": app = make_app() app.listen(8888) tornado.ioloop.IOLoop.current().start()

  8. How to update SQLAlchemy row with Marshmallow schema in Sanic

    • Description: This query seeks guidance on updating a SQLAlchemy row in a Sanic application with data validated by a Marshmallow schema.
    • Code:
      from sanic import Sanic, response from your_module import db, YourModel, YourSchema app = Sanic() @app.put("/update/<row_id:int>") async def update_row(request, row_id): existing_row = await YourModel.get_or_none(id=row_id) if existing_row: schema = YourSchema() update_data = schema.load(request.json) for key, value in update_data.items(): setattr(existing_row, key, value) await existing_row.save() return response.json({'message': 'Row updated successfully'}) else: return response.json({'message': 'Row not found'}, status=404) if __name__ == "__main__": app.run(host="0.0.0.0", port=8000)

  9. Updating SQLAlchemy row with Marshmallow schema in aiohttp

    • Description: This query focuses on updating a SQLAlchemy row in an aiohttp application with data validated by a Marshmallow schema.
    • Code:
      from aiohttp import web from your_module import db, YourModel, YourSchema async def update_row(request): row_id = int(request.match_info['row_id']) update_data = await request.json() existing_row = await YourModel.get_or_none(id=row_id) if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) await existing_row.save() return web.json_response({'message': 'Row updated successfully'}) else: return web.json_response({'message': 'Row not found'}, status=404) app = web.Application() app.router.add_put('/update/{row_id}', update_row) web.run_app(app)

  10. Update SQLAlchemy row with Marshmallow schema in aiohttp using view classes

    • Description: This query seeks guidance on updating a SQLAlchemy row in an aiohttp application with data validated by a Marshmallow schema using view classes.
    • Code:
      from aiohttp import web from your_module import db, YourModel, YourSchema class UpdateRowView(web.View): async def put(self): row_id = int(self.request.match_info['row_id']) update_data = await self.request.json() existing_row = await YourModel.get_or_none(id=row_id) if existing_row: schema = YourSchema() updated_data = schema.load(update_data) for key, value in updated_data.items(): setattr(existing_row, key, value) await existing_row.save() return web.json_response({'message': 'Row updated successfully'}) else: return web.json_response({'message': 'Row not found'}, status=404) app = web.Application() app.router.add_view('/update/{row_id}', UpdateRowView) web.run_app(app)

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