ruby-on-rails - Rails-UsersController＃create中的ArgumentError-参数太少

这可能真的很基本，但我似乎无法弄清楚。

本质上，当我尝试使用表单创建新用户并且用户详细信息已经存在并且不唯一时，我收到以下错误消息:

ArgumentError in UsersController#create

too few arguments

Application Trace | Framework Trace | Full Trace
app/controllers/users_controller.rb:61:in `format'
app/controllers/users_controller.rb:61:in `create'

这是我的create中的user_controller.rb动作:

  # POST /users
  # POST /users.xml
  def create
      @user = User.new(params[:user])

        if @user.save
          flash[:notice] = 'User successfully created' and redirect_to :action=>"index"
        else
          format.html { render :action => "new" }
          format.xml  { render :xml => @user.errors, :status => :unprocessable_entity }
        end
      end
    end

这是我的user.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :username, :password, :password_confirmation, :remember_me

  validates :email, :username, :presence => true, :uniqueness => true
end

这也是我的表格:

<%= simple_form_for(@user) do |f| %>
  <div class="field">
    <%= f.input :username %>
  </div>
  <div class="field">
    <%= f.input :email %>
  </div>
    <div class="field">
      <%= f.input :password %>
    </div>
    <div class="field">
      <%= f.input :password_confirmation %>
    </div>
  <div class="actions">
    <%= f.button :submit %>
  </div>
<% end %>

最佳答案

通过不同的rails版本，代码的确切布局有所变化(请张贴您使用的版本-检查Gemfile)。

此示例适用于Rails 3+(它是使用3.2.5生成的，但应适用于所有3+或至少3.1+版本)

def create
  @user = User.new(params[:user])

  respond_to do |format|
    if @user.save
      format.html { redirect_to @user, notice: 'Blob was successfully created.' }
      format.json { render json: @user, status: :created, location: @user}
    else
      format.html { render action: "new" }
      format.json { render json: @user.errors, status: :unprocessable_entity }
    end
  end
end

ps。 simple_form的不错选择，让生活变得更加轻松!