Question

我有公司的这个模型

class Company < ActiveRecord::Base
   attr_accessible :description, :name, :type
   belongs_to :type, :class_name => "CompanyType", :foreign_key => :company_type_id
end

这个公司类型的模型

class CompanyType < ActiveRecord::Base
  attr_accessible :name
end

然后在另一个_form文件中我想创建一个select，它只显示公司类型为“Financial”的公司列表。如果该公司的类型是“油”，则不要在下拉列表中显示它。

如何将其插入此select_tag代码并更改模型？

<%= select_tag :company, 
    options_from_collection_for_select(Company.order(:name), "id", "name"),
    :include_blank => true%>

Answer 1

<%= select_tag :company, 
options_from_collection_for_select(Company.where(:type => "Financial").order(:name), "id", "name"),
:include_blank => true%>

基本上只需添加.where（：type =＆gt;“Financial”），就可以在其中添加一个简单的.where语句。虽然您可能想要删除

Company.where(:type => "Financial").order(:name)

到您的控制器并将其保存在像

这样的实例变量中

@companies = Company.where(:type => "Financial").order(:name)

并且视图逻辑看起来像这样。

<%= select_tag :company, 
options_from_collection_for_select(@companies, "id", "name"),
:include_blank => true%>

编辑更新的问题

模型

class CompanyType < ActiveRecord::Base
  has_many :companies
  attr_accessible :name
end

控制器

@companies = CompanyType.where(:name => "Financial").companies.order(:name)

并且视图逻辑看起来像这样。

<%= select_tag :company, 
options_from_collection_for_select(@companies, "id", "name"),
:include_blank => true%>

select_tag rails，仅显示特定列表

1 个答案: