how to display json and parse json in ruby using httparty - ruby

Question

I am working on a food app in ruby on rails which requires to get calorie value of food item from food api.In my controller i am getting the JSON response but i am unable to parse and display the calorie value of food item in a index.html.erb file here is my controller code.
require 'rubygems'
require 'httparty'
class FoodsController < ApplicationController
def index
#foods = Food.all
end
def show
#food = Food.find(params[:id])
end
def new
#food = Food.new
end
def edit
#food = Food.find(params[:id])
end
def create
#food = Food.new(food_params)
#response = HTTParty.get('http://api.nutritionix.com/v1_1/search/'+#food.name+'?fields=item_name%2Citem_id%2Cbrand_name%2Cnf_serving_size_unit%2Cnf_calories%2Cnf_total_fat&appId=696d1ad4&appKey=aec2c4766d40d7f6346ed89d5d82fe75')
#http_party_json = JSON.parse(#response.body)
if #food.save
redirect_to foods_path
else
render 'new'
end
end
def update
#food = Food.find(params[:id])
if #food.update(food_params)
redirect_to #food
else
render 'edit'
end
end
def destroy
#food = Food.find(params[:id])
#food.destroy
redirect_to foods_path
end
private
def food_params
params.require(:food).permit(:name, :quantity)
end
end
Any suggestions are highly welcome as i am newbie on stackoverflow so dont know proper editing forgive please! help me how to display calorie value in html page

Answer 1

You can add a new function to Food model to get you the Calorie:
class Food
def calorie
response = HTTParty.get("http://api.nutritionix.com/v1_1/search/#{self.name}?fields=item_name%2Citem_id%2Cbrand_name%2Cnf_serving_size_unit%2Cnf_calories%2Cnf_total_fat&appId=696d1ad4&appKey=aec2c4766d40d7f6346ed89d5d82fe75")
json = JSON.parse(response.body)
end
end
and then simply in your index.erb if you loop over foods collection you do the following:
<% #foods.each do |food| %>
<%= food.name %>
<%= food.calorie %>
<% end %>
but in that case performance will not be good, as you do remote access for each item each time you display data, so as calorie value is always the same for same food, then after its created you can do remote query and store the calorie to calorie attribute in your Food model
You can do the following:
class Food < ActiveRecord::Base
before_create :set_calorie
private
def set_calorie
response = HTTParty.get("http://api.nutritionix.com/v1_1/search/#{self.name}?fields=item_name%2Citem_id%2Cbrand_name%2Cnf_serving_size_unit%2Cnf_calories%2Cnf_total_fat&appId=696d1ad4&appKey=aec2c4766d40d7f6346ed89d5d82fe75")
self.calorie = JSON.parse(response.body)
end
end