Ruby-on-rails 添加带有 simple_form 的复选框而不与模型关联？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9182434/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
add checkbox with simple_form without association with model?
提问by Mikhail Grishko
How I can add checkbox with simple_form without association with model? I want to create checkbox which will handle some javascript events, but don't know? Maybe I miss something in documentation? Want't to use similar like following:
如何在不与模型关联的情况下使用 simple_form 添加复选框？我想创建一个复选框来处理一些 javascript 事件，但不知道？也许我错过了文档中的某些内容？不想使用类似如下：
= simple_form_for(resource, as: resource_name, url: session_url(resource_name), wrapper: :inline) do |f|
.inputs
= f.input :email, required: false, autofocus: true
= f.input :password, required: false
= f.input :remember_me, as: :boolean if devise_mapping.rememberable?
= my_checkbox, 'some text'
回答by Gacha
You can add a custom attribute to the model:
您可以向模型添加自定义属性：
class Resource < ActiveRecord::Base
attr_accessor :custom_field
end
Then use this field as block:
然后将此字段用作块：
= f.input :custom_field, :label => false do
= check_box_tag :some_name
Try to find "Wrapping Rails Form Helpers" in their documentation https://github.com/plataformatec/simple_form
尝试在他们的文档https://github.com/plataformatec/simple_form 中找到“Wrapping Rails Form Helpers”
回答by huoxito
You could use
你可以用
f.input :field_name, as: :boolean
回答by m4r73n
The command proposed by huoxito does not work (at least not in Rails 4). As far as I figured out the error is caused by Rails trying to look up the default value for :custom_field, but because this field does not exists this lookup fails and an exception is thrown.
huoxito 提出的命令不起作用（至少在 Rails 4 中不是）。据我所知，错误是由 Rails 尝试查找 的默认值引起的:custom_field，但由于此字段不存在，因此查找失败并引发异常。
However, it works if you specify a default value for the field using the :input_htmlparameter, e.g. like this:
但是，如果您使用:input_html参数为字段指定默认值，它会起作用，例如：
= f.input :custom_field, :as => :boolean, :input_html => { :checked => "checked" }
回答by eXa
This question comes first on google with no appropriate answer.
这个问题首先出现在谷歌上，没有合适的答案。
Since Simple Form 3.1.0.rc1 there is a proper way of doing it explained on the wiki: https://github.com/plataformatec/simple_form/wiki/Create-a-fake-input-that-does-NOT-read-attributes
从 Simple Form 3.1.0.rc1 开始，wiki 上解释了正确的方法：https: //github.com/plataformatec/simple_form/wiki/Create-a-fake-input-that-does-NOT-read -属性
app/inputs/fake_input.rb:
app/inputs/fake_input.rb：
class FakeInput < SimpleForm::Inputs::StringInput
# This method only create a basic input without reading any value from object
def input(wrapper_options = nil)
merged_input_options = merge_wrapper_options(input_html_options, wrapper_options)
template.text_field_tag(attribute_name, nil, merged_input_options)
end
end
Then you can do
<%= f.input :thing, as: :fake %>
然后你可以做
<%= f.input :thing, as: :fake %>
For this specific question you have to change the second line of the method to:
对于这个特定问题，您必须将方法的第二行更改为：
template.check_box_tag(attribute_name, nil, merged_input_options)
For versions prior 3.1.0.rc1 admgc gave a solution that is adding the missing method merge_wrapper_options:
对于 3.1.0.rc1 之前的版本，admgc 给出了添加缺少方法的解决方案merge_wrapper_options：
回答by Benjamin Dobell
Add this to app/inputs/arbitrary_boolean_input.rb:
将此添加到app/inputs/arbitrary_boolean_input.rb：
class ArbitraryBooleanInput < SimpleForm::Inputs::BooleanInput
def input(wrapper_options = nil)
tag_name = "#{@builder.object_name}[#{attribute_name}]"
template.check_box_tag(tag_name, options['value'] || 1, options['checked'], options)
end
end
then use it in your views like:
然后在您的视图中使用它，例如：
= simple_form_for(@some_object, remote: true, method: :put) do |f|
= f.simple_fields_for @some_object.some_nested_object do |nested_f|
= nested_f.input :some_param, as: :arbitrary_boolean
i.e. The above implementation supports nested fields correctly. Other solutions I've seen do not.
即上述实现正确支持嵌套字段。我见过的其他解决方案没有。
Note:This example is HAML.
注意：此示例是 HAML。
回答by Anton Sergeyev
Here is another variation:
这是另一个变体：
= f.label :some_param, class: "label__class" do
= f.input_field :some_param, class: "checkbox__class"
Label text
