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Python Flask REST API Resourceful Blueprints Ingredient Fields

Posted by Alejandro Ochoa
Alejandro Ochoa
Courses Plus Student 10,671 Points

Help... Hit a dead-end in Task 2 of 2 Marshal challenge...

It just tells me IngredientList.get() did not get the proper result... I've tried everything nothing seems to work...

Thanks

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": fields.String,
  "description": fields.String,
  "recipe" : fields.String,
  "measurement_type": fields.String,
  "quantity" : fields.Float
}


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__()

    def get(self):
        ingredients = [marshal(ingredient, ingredient_fields) for model in models.Ingredients.select()]
        return {"ingredients": ingredients}



    @marshal_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__()
    @marshal_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

Lukas Hölzer
Lukas Hölzer
37,349 Points
Lukas Hölzer
Lukas Hölzer
37,349 Points

Hi Alejandro,

you nearly did it. Just make two changes in your get method:

  1. for model -> for ingredient
  2. models.Ingredients.select() -> models.Ingredient.select()

that's the code that worked for me:

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': fields.String,
    'description': fields.String,
    'measurement_type': fields.String,
    'quantity': fields.Float,
    'recipe': fields.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__()


    def get(self):
        ingredients = [marshal(ingredient, ingredient_fields)
                       for ingredient in models.Ingredient.select()]
        return {'ingredients': ingredients}

    @marshal_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__()

    @marshal_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>')
Alejandro Ochoa
Alejandro Ochoa
Courses Plus Student 10,671 Points

Thanks m8... much appreciated