Simple_form: simple_fields_for 未显示表格

Question

我正在尝试以一种形式创建两个模型。我有 user 和 unit 模型都与 has_many 关联：通过关联。

user.rb

class User < ActiveRecord::Base
  has_many :units, :through => :user_unit_assocs
  has_many :user_unit_assocs
end

unit.rb

class Unit < ActiveRecord::Base
  has_many :users, :through => :user_unit_assocs
  has_many :user_unit_assocs
end

users_controller.rb

class UsersController < ApplicationController
  def create
    @user = User.new(user_params)
    @user.units.build
    respond_to do |format|
      if @user.save
        format.html { redirect_to @user, notice: 'User was successfully created.' }
      else
        format.html { render :new }
      end
    end
  end

  private
  def user_params
      params.require(:user).permit(:username, :email, units_attributes:[:unitname])
    end
end

这是我的表单，用户 new

<%= simple_form_for(@user) do |f| %>
  <%= f.simple_fields_for :units do |unit| %>
    <%= unit.input :unitname, required: true %>
  <% end %>
  <%= f.input :name, required: true %>
  <%= f.input :email, required: true %>

  <%= f.button :submit %>
<% end %>

当我运行代码时，表单只显示 :name 和 :email 的输入字段，没有 units:[:unitname] 的输入字段。如何在表单中显示输入字段？提前致谢。

参考资料： 1. Rails 4: accepts_nested_attributes_for and mass assignment 2. https://github.com/plataformatec/simple_form/wiki/Nested-Models

Answer 1

您需要在新操作中建立关联，而不是在创建操作中。

Answer 2

添加

def new
  @user = User.new
  @user.units.build
end

在你的控制器上

Simple_form: simple_fields_for 未显示表格

Simple_form: simple_fields_for not showing the form

forms

ruby-on-rails

ruby-on-rails-4

simple-form-for