How to extract JSON array fields using HTTParty?

Question

I am using FOOD2FORK api to extract data using HTTParty in ruby.

My code :

require 'httparty'  #Note : This file is in the models >> filename.rb
#Don't need to require when using bundler
#Restful Web Services 
#1. Base URI 2. Support XML or JSON 3. Support HTTP operations (GET, POST)
#Think of web at MVC : website you can get resources in any format 
#HTTParty parses XML or JSON for you (like your browser - it's a client).  Parses into a Ruby hash or array

class Recipe
    include HTTParty
    ENV["FOOD2FORK_KEY"] = "5b6b74c6cc0fa9dc23871a7ae753f6c7"

    base_uri "https://food2fork.com/api" #Same across most requests 
    default_params key: ENV["FOOD2FORK_KEY"], fields: "image_url" #defaults, like API developer key #fields: "image_url, source_url, title",
    format :json #Tell it which format data comes in
    #q:"search" request parameter 

    def self.for (keyword) 
        #class method called for which takes in a term 
        get("/search", query: {q: keyword})["recipes"]  #get is method provided by HTTParty 


        #returns array where each element in the array is a hash 
    end 
    pp Recipe.for "chocolate"
end

It's returning me

[
  {
    "publisher"=>"BBC Good Food", 
    "f2f_url"=>"http://food2fork.com/view/9089e3", 
    "title"=>"Cookie Monster cupcakes", 
    "source_url"=>"http://www.bbcgoodfood.com/recipes/873655/cookie-monster-cupcakes",
    "recipe_id"=>"9089e3", 
    "image_url"=>"http://static.food2fork.com/604133_mediumd392.jpg", 
    "social_rank"=>100.0, 
    "publisher_url"=>"http://www.bbcgoodfood.com"
  }
]

But I only want to extract it's image_url even on using field it's extracting the whole data set any idea how to extract only image_url ?

P.S You can check the format of JSON here - http://food2fork.com/api/search?key=65987bf1f4b22007c365c243f5670f35&q=shredded%20chicken

Assuming, you are storing the response response.map{|res| res["image_url"]} should do the trick for you. — Kedarnag Mukanahallipatna
– Kedarnag Mukanahallipatna, Commented Aug 30, 2018 at 5:19
If I understand your problem correctly, you want to return only the image_urls as response. This I think is not possible since it is an external API. You can fetch the image_urls from the response though with this response[:recipes].map{|x| x['image_url']} — Ravi Teja Dandu
– Ravi Teja Dandu, Commented Aug 30, 2018 at 5:35

Vishal · Accepted Answer · 2018-08-30 06:23:28Z

1

Below code should work

response = your response from API

response_data = JSON.parse(response.body).with_indifferent_access

response_data['recipes'].each do |recipe|
  puts recipe['image_url'] # image_url of block
end

edited Aug 30, 2018 at 6:23

answered Aug 30, 2018 at 5:26

Vishal

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2 Comments

Aleksei Matiushkin Over a year ago

1. with_indifferent_access makes no sense; 2. this code produces several local variables inside a block, immediately discarded and returns nothing useful. The comment by @KedarnagMukanahallipatna above is correct and should be considered the valid answer.

Vishal Over a year ago

@mudasobwa 1) it make sense if developer want to fetch with symbol instead of string 2) Yes. i know it will produce lots local variables and its not useful but its only for understanding of OP

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