未随表单提交的列中的默认值

Question

我为迁移文件中的列添加了一个默认值，但它不会以在数据库中显示为空字符串的形式提交。我可以使用下拉菜单选择 select 其他类别，这些类别将会保存，但是 "all users" 的默认值不会。

我在 Rails 4.2.4

迁移文件

class AddPrivacyLevelToArticles < ActiveRecord::Migration
  def change
    add_column :articles, :privacy_level, :string, default: "All Users"
  end
end

我表单中的字段。

  <div class="form-group private_categories">
    <%= f.label :privacy_level, { :class => "col-sm-2 control-label" } %>
    <div class="col-sm-4">
      <%= f.select :privacy_level, Article::PRIVACY_CATEGORIES,
        { include_blank: 'Please Select' }, class: "form-control" %>
    </div>
  </div>

在文章模型中

  PRIVACY_CATEGORIES = ["Me only", "My Organization", "Multiple Organizations"]

Answer 1

您可以使用枚举。 Doc

# models/article.rb
enum privacy_level: { all_users: 0, me_only: 1, 
                      my_organization: 2, 
                      multiple_organizations: 3}

#or
enum privacy_level:  [:all_users, :me_only, 
                      :my_organization, 
                      :multiple_organizations]


#migration
add_column :articles, :privacy_level, :integer, default: 0


# View - form
Article.privacy_levels
=> {"all_users" => 0, "me_only" => 1 ...}

未随表单提交的列中的默认值

default value in column not submitting with form

ruby-on-rails

ruby-on-rails-4