railsでjsonをparseする

Gemfileに以下を追加

gem 'jbuilder', '~> 1.2'

Controllerにこんな感じで書く

json_data = JSON.parse(get_json)
second_level_items = json_data['children'].map {|c| c['child']}
second_level_items.each do |item|
  genre = Genre.find_by_genre_id(item['genreId'])
  genre = Genre.new(genre_id: item['genreId'], name: item['genreName']) unless genre
  genre.save()
end
hoge = JSON.parse(hoge)

Viewにこんな感じで書く

<%= debug(hoge) %>

Basic認証付きならこんな感じ

begin
  httpClient.set_auth("https://kyoto.smartercity.jp/api/v1/places", "username", "password");
  data = httpClient.get_content("https://kyoto.smartercity.jp/api/v1/places", {
    "rdf_type" => rdf_types.join(",")
  });
  @jsonData = JSON.parse data
  rescue HTTPClient::BadResponseError => e
  rescue HTTPClient::TimeoutError => e
end