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Python Flask REST API Resourceful Blueprints Ingredient Fields

Jeremy Dyck
Jeremy Dyck
12,013 Points
Posted by Jeremy Dyck
Jeremy Dyck
12,013 Points

Flask REST API - Ingredient Fields: What is wrong with my code?

I need to create a dictionary then use @marshall_with to complete the challenge. Just not sure where my error is.

resources/ingredients.py 
from flask import Blueprint

from flask.ext.restful import (
    Resource, Api, reqparse, inputs,
    marshal, marshal_with, fields
)

import models

ingredient_fields{
    'name': field.String,
    'description': field.String,
    'measurement_type' = field.String,
    'quantity' = field.Float,
    'recipe' = field.String
}

class IngredientList(Resource):
    def __init__(self):
        self.reqparse = reqparse.RequestParser()
        self.reqparse.add_argument(
            'name',
            required=True,
            location=['form', 'json']
        )
        self.reqparse.add_argument(
            'description',
            required=True,
            location=['form', 'json']
        )
        self.reqparse.add_argument(
            'measurement_type',
            required=True,
            location=['form', 'json']
        )
        self.reqparse.add_argument(
            'quantity',
            type=float,
            required=True,
            location=['form', 'json']
        )
        self.reqparse.add_argument(
            'recipe',
            type=inputs.positive,
            required=True,
            location=['form', 'json']
        )
        super().__init__()

    @marshall_with(ingredient_fields)
    def get(self):
        ingredients = models.Ingredient.select()
        return ingredients

    @marshall_with(ingredient_fields)
    def post(self):
        args = self.reqparse.parse_args()
        ingredient = models.Ingredient.create(**args)
        return ingredient


class Ingredient(Resource):
    def __init__(self):
          self.reqparse = reqparse.RequestParser()
          self.reqparse.add_argument(
              'name',
              required=True,
              location=['form', 'json']
          )
          self.reqparse.add_argument(
              'description',
              required=True,
              location=['form', 'json']
          )
          self.reqparse.add_argument(
              'measurement_type',
              required=True,
              location=['form', 'json']
          )
          self.reqparse.add_argument(
              'quantity',
              type=float,
              required=True,
              location=['form', 'json']
          )
          self.reqparse.add_argument(
              'recipe',
              type=inputs.positive,
              required=True,
              location=['form', 'json']
          )
          super().__init__()

    @marshall_with(ingredient_fields)
    def get(self, id):
        ingredient = models.Ingredient.get(models.Ingredient.id==id)
        return ingredient

ingredients_api = Blueprint('resources.ingredients', __name__)
api = Api(ingredients_api)
api.add_resource(IngredientList, '/api/v1/ingredients')
api.add_resource(Ingredient, '/api/v1/ingredients/<int:id>')

1 Answer

Josh Keenan
Josh Keenan
20,315 Points
Josh Keenan
Josh Keenan
20,315 Points

I have no clue what is going on in your dictionary but here's mine:

ingredient_fields{
    'name': field.String,
    'description': field.String,
    'measurement_type' = field.String,
    'quantity' = field.Float,
    'recipe' = field.String
}

Yours isn't consistent and you also used field.String instead of fields, and you forgot the = at the start!

The lesson here is KISS (keep it simple stupid), sometimes just scrapping what you have and rewriting it can solve the issue, sometimes you need to delve deep. Don't start at the bottom and work up, start with the simplest solutions and mistakes and verify it's nothing simple like a missing operator or a typo. Once you know its nothing like that, then delve into the more complex potential problems.

Hope this helps!