simple_form接受用于集合输入的哈希

时间:2019-03-20 22:21:07

标签: ruby-on-rails simple-form ruby-on-rails-5.2 simple-form-for

当前行为

使用simple_form,您需要传递一个数组:

<%= f.input :my_field, collection: [[true,"Yes"],[false,"No"]] %>

预期行为

能够传递散列会很好,因此您不需要对传递的每个散列进行invert.sort。有什么办法可以对每个输入执行此操作吗?

<%= f.input :my_field, collection: {"true"=> "yes", "false"=>"No" } %>

是否可以在没有invert.sort?的情况下将哈希直接传递到输入中?

2 个答案:

答案 0 :(得分:1)

您可以添加自己的助手my_simple_form_for来使用自己的YourFormBuilder

module ApplicationHelper
  def my_form_for record, options = {}, &block
    options[:builder] = MyFormBuilder
    simple_form_for(record, options, &block)
  end
end

或者以这种方式使用它:

<%= simple_form_for @record, builder: MyFormBuilder do |f| %>

在您自己的构建器中,您可以覆盖input

class YourFormBuilder < SimpleForm::FormBuilder

  def input(attribute_name, options = {}, &block)
    options[:collection] = options[:collection].invert.sort if options[:collection].present? and options[:collection].kind_of? Hash
    super
  end

end

答案 1 :(得分:0)

基于我们的earlier Q&A,您可以增强Hash扩展名使其包含as_select_options

module DropdownExt

  def self.extended(receiver)

    receiver.each do |k,v|
      define_method(k) do 
        v.is_a?(Hash) ? v.extend(DropdownExt) : v
      end
    end

    define_method(:as_select_options) do 
      unless receiver.values.map{|v|v.class}.include?(ActiveSupport::HashWithIndifferentAccess)
        receiver.invert.sort
      else
        []
      end
    end

  end
end

class Dropdowns

  class << self

    private

    def dropdowns_spec
      YAML.load_file("#{path}").with_indifferent_access
    end

    def path
      Rails.root.join("spec/so/dropdowns/dropdowns.yaml") # <== you'll need to change this
    end

  end

  dropdowns_spec[:dropdown].each do |k,v|
    define_singleton_method k do 
      v.extend(DropdownExt)
    end
  end

  %i(
    truck_model
    bike_model
  ).each do |to_alias|
    singleton_class.send(:alias_method, to_alias, :car_model)
  end

end

哪个可以让您执行以下操作:

Dropdowns.car_model.field1.as_select_options
 => [["false", "no"], ["true", "yes"]]

或者,我想:

<%= f.input :my_field, collection: Dropdowns.car_model.field1.as_select_options %>

这不能避免invert.sort。但是,它确实将其掩埋了一点并用方便的as_select_options方法将其包装起来。