mashable_homework_je.rb

# Class 07 Homework

# 7.3.2014
# By Josh Esguia

# ASSIGNMENT

# Using http://mashable.com/stories.json and sinatra, show 
# a webpage listing all the articles with images next to them.

# BONUS
# -----

# * Filter by category
# * Filter by author
# * Sorting by social shares



##################################
# Acquire and pars article JSON
##################################

require 'sinatra'
require 'httparty'

response = HTTParty.get('http://www.mashable.com/stories.json')

# Turn the JSON string into arrays and hashes
# From looking at the JSON, data is formatted as: 
# main hash (keys: category, values: article array) ->
# article array -> article details hash


# Provide sorting options

get '/' do
  erb :home
end


##################################################
# Sort by Category
##################################################

# Pass parsed response to .erb file
get '/by_category' do
  @mashable_hash = response.parsed_response
  erb :by_category
end



##################################################
# Sort by Author
##################################################

get '/by_author' do

  mashable_hash = response.parsed_response
  all_articles_array = []

  # Extract all articles from category hashes
  # and shovel them into all_articles_array
  
  # there's a handy way you could achieve the same result as below by using map:
  
  # all_articles_array = mashable_hash.map { |category, array| array }
  
  # this creates a new array, iterating over each key value pair in your hash.
  # by specifying 'array' in the block, I'm saying that I want to return the 
  # value (in this case, array) of each key pair in my new array

  mashable_hash.each do |category, article_array|
    
    # I'd stay away from using != nil and move towards just enforcing the presence of your article_array:
    
    # if article_array
    # .. do stuff
    # end
    if article_array != nil
      article_array.each do |one_article_hash|
        all_articles_array << one_article_hash
      end
    end
  end

  # Now you can sort by author

  @articles_by_author_hash = {}

  all_articles_array.each do |article_hash|

    # Grab all necessary data from each article
    # within the main article array

    author_name = article_hash["author"]

    # Create a new hash (k: author name, v: array of 
    # hashes of his or her articles)
    
    # GREAT! really nice usage of unless, similar to how we did it in class
    
    unless @articles_by_author_hash.has_key?(author_name)
      @articles_by_author_hash[author_name] = []
    end

    @articles_by_author_hash[author_name] << article_hash
  end

  # articles_by_author_hash is now all set to pass
  # to the .erb file

  erb :by_author

end


##################################################
# Sort by Shares
##################################################

get '/by_shares' do

  mashable_hash = response.parsed_response
  all_articles_array = []

  # Extract all articles from category hashes
  # and shovel them into all_articles_array

  mashable_hash.each do |category, article_array|
    
    # again, try just checking for the presence: "if article_array"
    # I saw this in your category.erb as well
    
    if article_array != nil
      article_array.each do |one_article_hash|
        all_articles_array << one_article_hash
      end
    end
  end

  # Now you can sort by shares
  
  # nice use of sort_by below!

  @all_articles_array = all_articles_array.sort_by{|k| k["shares"]["total"]}.reverse

  # And once sorted, pass the array to the .erb
  # for display

  erb :by_shares

end