活动管理字段上的布尔值返回空而不是true或false（Rails 3.2 / Active Admin）(Boolean on active admin field returns empty in

活动管理字段上的布尔值返回空而不是true或false（Rails 3.2 / Active Admin）(Boolean on active admin field returns empty instead of true or false (Rails 3.2/Active Admin))

我正在建立一个日常交易应用程序来训练学习RoR。

在我的Deal表单中，我有一个名为“featured”的布尔字段。 如果我选中复选框，则会显示交易（而不是草稿）。

但是当我在主动管理我的交易创建时，如果我选中复选框，我确实得到'真'（那部分没问题），但是如果我不检查它， 我得到'空'而不是'假' 。

我不应该弄错吗？

这是我的文件：

架构迁移：

create_table "deals", :force => true do |t| t.string "title" t.string "description" t.boolean "featured" t.integer "admin_user_id" t.datetime "created_at", :null => false t.datetime "updated_at", :null => false end

和Active Admin上的表单（我认为它默认使用formtastic for forms）

ActiveAdmin.register Deal do controller do with_role :admin_user end form do |f| f.inputs "Content" do f.input :description, :label => "Deal description" f.input :title, :label => "Deal title" end f.inputs "Status" do f.input :featured, :label => "Status of publication (draft or featured)" end f.inputs "Publisher" do f.input :admin_user_id, :as => :select, :collection => AdminUser.all, :label => "Campaign Account Manager" end f.actions end end

任何人都知道为什么在“特色”栏中，当我在创建交易时没有选中“特色”字段的复选框时，我可以读取“空”而不是“假”？

I am building a daily deal app to train learning RoR.

On my Deal form, I have a boolean field called "featured". If I check the checkbox, the deal is featured (as opposed to a draft).

But when I create on active admin my Deal, if I check the checkbox, I do get 'true' (that part is ok), but if I don't check it, I am getting 'empty' instead of 'false'.

Shouldn't I get false?

Here are my files:

schema migration:

create_table "deals", :force => true do |t| t.string "title" t.string "description" t.boolean "featured" t.integer "admin_user_id" t.datetime "created_at", :null => false t.datetime "updated_at", :null => false end

And the form on Active Admin (it uses formtastic for forms by default I think)

ActiveAdmin.register Deal do controller do with_role :admin_user end form do |f| f.inputs "Content" do f.input :description, :label => "Deal description" f.input :title, :label => "Deal title" end f.inputs "Status" do f.input :featured, :label => "Status of publication (draft or featured)" end f.inputs "Publisher" do f.input :admin_user_id, :as => :select, :collection => AdminUser.all, :label => "Campaign Account Manager" end f.actions end end

Anybody has an idea why in the column "featured" I can read "empty" instead of "false" when I don't check the checkbox of the "featured" field when creating Deals?

最满意答案

我假设通过'空'，你不是指字面意思，但你的意思是字段没有价值或是空的。 您没有为字段设置默认值或在其中输入任何数据，因此它是空的，或者在Ruby白话中，为零。 要设置默认值，您可以执行以下操作：

create_table "deals", :force => true do |t| t.string "title" t.string "description" t.boolean "featured" :default => false t.integer "admin_user_id" t.datetime "created_at", :null => false t.datetime "updated_at", :null => false

对于更复杂的值，还有其他设置默认值的方法。 例如，如果要将datetime字段的默认值设置为当前时间，则可以使用before_create出口：

before_create :set_foo_to_now def set_foo_to_now self.foo = Time.now end

或者，您可以确保在自己创建新记录时输入值。

作为参考，请参阅有关ActiveRecord迁移的本文 。

I am assuming that by 'empty', you don't mean the literal but you mean the field has no value or is empty. You haven't set a default for the field or entered any data into it, so it is empty or, in the Ruby vernacular, nil. To set a default, you can do something like this:

create_table "deals", :force => true do |t| t.string "title" t.string "description" t.boolean "featured" :default => false t.integer "admin_user_id" t.datetime "created_at", :null => false t.datetime "updated_at", :null => false

There are other methods for setting defaults as well, for more complex values. For example, if you wanted to set the default for a datetime field to the current time, you would use a before_create exit:

before_create :set_foo_to_now def set_foo_to_now self.foo = Time.now end

Or, you can simply make sure you enter a value when you create the new record yourself.

As a reference, see this text on ActiveRecord migrations.