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Python Flask REST API Resourceful Blueprints Parse the Request

Posted by William Ennals
William Ennals
9,441 Points

Having trouble with the Parsing the Request - Ingredients challenge

The API needs to be able to validate input from users. Use reqparse and add arguments for each field in the Ingredient model to the IngredientList resource. Remember to add the RequestParser instance to the resource instance as self.reqparse.

name, description, and measurement_type should all be strings (the default) quantity should be a normal Python float recipe should be positive, which you'll get from inputs They should all be required and have their location set to ["form", "json"].

I believe my code is right, but for some reason im getting an error

resources/ingredients.py 
from flask import Blueprint

from flask.ext.restful import Resource, Api, reqparse, inputs

import models


class IngredientList(Resource):
     def __init__(self):
        self.reqparse = reqparse.RequestParser()
        self.reqparse.add_argument(
                'name',
                required=True,
                help = 'no data provided',
                location = ['form', 'json']
        )
        self.reqparse.add_argument(
                'description',
                required=True,
                help = 'no data provided',
                location = ['form', 'json']
        )
        self.reqparse.add_argument(
                'quantity',
                required=True,
                help = 'no data provided',
                type = float,
                location = ['form', 'json']
        )
        self.reqparse.add_argument(
                'measurement_type',
                required=True,
                help = 'no data provided',
                location = ['form', 'json']
        )
        self.reqparse.add_argument(
                'recipe',
                required=True,
                help = 'no data provided',
                type = inputs.positive,
                location = ['form', 'json']
        )
    def get(self):
        return 'IngredientList'    

class Ingredient(Resource):
    def get(self, 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

Devin Roark
Devin Roark
4,608 Points
Devin Roark
Devin Roark
4,608 Points

try calling the super(),__init__() method at the end of your __init__ method