Question

user.rb

enum gender_type: [:male, :female] 
scope :gender, -> (gender_type) { where gender_type: gender_type}

userscontroller

@users = User.gender(params[:gender_type]).paginate(page: params[:page]) if params[:gender_type].present?

index.html.erb

<%= form_tag users_path, method: :get do %>
  <%= select_tag   ??????                                         %>
  <%= submit_tag "Search", :name => "nil", :id => "submit-gender" %>
<% end %>

目标是最终：

example.com/users?gender_type=0或example.com/users?gender_type=1

Answer 1

尝试那种

select_tag 'gender', "<option value=0>male</option><option value=1>female</option>".html_safe

或者像那样

select_tag 'gender', options_for_select([["male",0],["female",1]])

你可以阅读rails api来找到解决方案 http://apidock.com/rails/ActionView/Helpers/FormTagHelper/select_tag

Answer 2

（我假设您在文件名users.rb中输入错误并且它是常规的user.rb模型）

User.gender_types将返回哈希值{"male" => 0, "female" => 1}。听起来很简单！

select_tag :gender_type, options_for_select(User.gender_types)

Answer 3

要从枚举属性中获取映射，您可以use the pluralised version of the the enum attribute name：

User. gender_types 
=> { male: 0, female: 1 }

您可以致电Hash.to_a以获取可以传递给options_for_select的数组。但您可能希望使用.map来转换密钥。

class User
  self.gender_options
    # or use the I18n module to humanize the keys
    self.gender_types.map { |k,v| [k.capitalize, v] }
  end
end

<%= select_tag 'gender', options_for_select(User.gender_options) %>

Answer 4

您可以像这样简单地使用

<%= form_for(user) do |form| %>
    <%= form.select :gender_types, User.gender_types.keys.to_a %>
<% end %>

但是假设您使用Rails Internationalization I18n（我建议使用），则可能需要在视图帮助器中（或：

# app/helpers/users_helper.rb
def genders_select
  User.gender_types.map do |k,v|
    [User.human_enum_name(:gender_types, k), v]
  end
end

和

<%= form_for(user) do |form| %>
    <%= form.select :gender_types, @genders_select %>
<% end %>

在form_tag中使用enum和select

4 个答案: