Rails 5.1.: Jbuilder format single JSON object in array

Question

I have this piece of code in my update.json.jbuilder

json.data do
  json.(@user_group, :id, :name, :description)
  json.users @user_group.users, :id, :name
  json.roles @user_group.roles, :id, :name
end

which gives me this JSON:

{
   "data":{
      "id":95,
      "name":"Management group",
      "description":"This is management group",
      "users":[
         {
            "id":10,
            "name":"Test User"
         }
      ],
      "roles":[
         {
            "id":1,
            "name":"FULL ACCESS (TEMPORARY)"
         }
      ]
   }
}

How do I wrap "data" in array to something like this, please?

{
   "data": [ 
    {
      "id":95,
      "name":"Management group",
      "description":"This is management group",
      "users":[
         {
            "id":10,
            "name":"Test User"
         }
      ],
      "roles":[
         {
            "id":1,
            "name":"FULL ACCESS (TEMPORARY)"
         }
      ]
   }
 ]
}

Notice [ ] after first and last { } So far I've been trying to implement json.array!, but no luck as it throws me ActionView::Template::Error (undefined method map which means I'm trying to put together something which probably does not fit as mentioned here.

matiss · Accepted Answer · 2017-07-02 16:56:39Z

1

With child! method it seems to be this simple:

json.data do
  json.child! do
    json.(@user_group, :id, :name, :description)
    json.users @user_group.users, :id, :name
    json.roles @user_group.roles, :id, :name
  end
end

answered Jul 2, 2017 at 16:56

matiss

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