Question

我已经尝试在collection_select字段上添加required => true和：prompt =>“ select ...”，但是每次遇到语法错误时，我都会尝试添加。如何解决以下错误。

.field
  = f.label "Receiver"
  = f.collection_select(:receiver_admin_id, 
        Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), 
        :id, 
        :agent_name, 
        :prompt => 'Select receiver', 
        {multiple: true}), 
      :required => true

  = f.collection_select(:receiver_admin_id, 
        Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), 
        :id, 
        :agent_name, 
        :prompt => 'Select receiver', 
        {multiple: true, required: true})


  = f.collection_select(:receiver_admin_id, 
        Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), 
        :id, 
        :agent_name, 
        :prompt => 'Select receiver',
        {}, 
        {multiple: true}), 
      :required => true

  = f.collection_select :receiver_admin_id, 
        Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), 
        :id, 
        :agent_name, 
        :prompt => 'Select receiver', 
        {multiple: true}, 
        :required => true

Answer 1

请尝试以下操作：

  = f.collection_select :receiver_admin_id, Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), :id, :agent_name, {prompt: 'Select receiver'}, {multiple: true, required: true}

Answer 2

您几乎每次都关闭：)在文档in the rails guide中，您有：

collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})

使用表单助手（f.）意味着该对象（第一个参数）已得到处理，因此您只剩下：

method, collection, value_method, text_method, options, html_options

倍数和必需都在html_options中，因此：

= f.collection_select(:receiver_admin_id, Admin.agent_and_admin(current_admin.id, current_admin.parent_master_agent_id), :id, :agent_name, { :prompt => 'Select receiver' }, multiple: true, :required => true)

如何在collection_select类型字段上添加必需的true

2 个答案: