ruby-on-rails-3 - json format in ruby on rails?

Question

How to send data in database and show in needed part by using json format in ruby on rails3?

my form is like this

<%= form_for(@user) do |f| %>
  <% if @user.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

      <ul>
      <% @user.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :email %><br />
    <%= f.text_field :email %>
  </div>
  <div class="field">
    <%= f.label :login %><br />
    <%= f.text_field :login %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

Answer 1

在控制器中：

def show
  @user = User.find(params[:user_id]
  respond_to do |format|
    format.json { :render => @user }
  end
end

您可以通过覆盖as_jsonUser 模型中的 来自定义 JSON 输出：

  def as_json(options=false)
    self.include_root_in_json = false
    options = (options || {}).reverse_merge(
      :except => [:updated_at, :created_at, :id],
      :include => :some_association
    )
    super(options)
  end