Return multiple sets within json

multi_json.rb

require 'sinatra/json'

get "/posts" do
  @posts = Post.order("created_at DESC")
  erb :'posts/index'
end

post "/posts" do
  p params
  @post = Post.new(params[:post])

  if @post.save
    if request.xhr?
      #
      # erb :'/posts/_post', layout: false, locals: { post: @post }
      page = erb :'/posts/show', layout: false, locals: { post: @post }
      json post: @post, page: page
    else
      redirect "posts/#{@post.id}"
    end
  else
    # this is where errors should be handled
  end
end

get "/posts/new" do
  if request.xhr?
    erb :'/posts/_form', layout: false
  else
    erb :'posts/new'
  end
end

get "/posts/:id" do
  @post = Post.find(params[:id])
  erb :'posts/show'
end