使用参数散列保存在轨道4.0中的记录

Question

我想在使用form_for帮助器方法的轨道中创建一个新的记录。我认为params散列是空白的，因为当我提交表单时，我一直收到空白的错误。

这是我的形式：

<% provide(:title, "Add Department") %> 
<h1>Add Department</h1> 

<div class="row"> 
    <div class="span6 offset3"> 
     <%= form_for(@department) do |f| %> 
      <%= render 'shared/department_error_messages' %> 

      <%= f.label :Full_Department_Title %> 
      <%= f.text_field :full_name %> 

      <%= f.label :Department_Abbreviation %> 
      <%= f.text_field :abbreviation %> 

      <%= f.submit "Add department", class: "btn btn-large btn-primary" %> 
     <% end %> 
    </div> 
</div> 

这是我的部门控制器

class DepartmentsController < ApplicationController 
    def show 
     @department = Department.find(params[:id]) 
    end 

    def new 
     @department = Department.new 
    end 

    def create 
     @department = Department.new(params[department_params])  # Not the final implementation! 
     if @department.save 
      redirect_to root_path 
     else 
      render 'new' 
     end 
    end 

    private 

    def department_params 
     # This says that params[:department] is required, but inside that, only params[:department][:full_name] and 
     # params[:department][:abbreviation] are permitted. Unpermitted params will be stripped out   

     params.require(:department).permit(:full_name, :abbreviation) 
    end 
end 

这是型号：

class Department < ActiveRecord::Base 
    validates :full_name, presence: true, length: { minimum: 6 } 
end 

当我提交，错误被渲染称FULL_NAME不能为空（并且字段现在为空）。调试信息是：

--- !ruby/hash:ActionController::Parameters utf8: ✓ 
authenticity_token: EjfYjWAzaw7YqVZAkCPZwiEMFfb2YLIRrHbH1CpZOwA= 
department: !ruby/hash:ActionController::Parameters 
full_name: Sports Department 
abbreviation: SD 
commit: Add department 
action: create 
controller: departments 

我也检查了开发日志。交易开始并被回滚。我可以在控制台中保存一条记录，所以我猜测它与params散列有关，但无法弄清楚。请帮助

Answer 1

这条线：

@department = Department.new(params[department_params]) 

应该是：

@department = Department.new(department_params) 

而且，作为一个小问题（但并未导致此问题），您的标签标签应该是这样的：

f.label :full_name, "Full Department Title" 

这样它们与输入正确关联。