将选中的数组传递给rails aplication中表单视图上的select2字段

Question

在我的ruby on rails应用程序中，我有一个名为@card的类，其中包含很少的select2标记字段，例如：

<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true} %>

@card.tag_location的值可以是：["", "Asa Norte", "Asa Sul"]或["", "Lago Norte", "Asa Sul"]

我试图在UPDATE视图中将此字段标记为已选中，并显示数组的值：

我试过了：

1）<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location, :selected => params[:tag_location]), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true} %>

2）<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location, params[:tag_location]), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true} %>

3）<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true, data: {selected: @card.tag_location}} %>

3）<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true, data: {selected: @card.tag_location.drop(1)}} %>

我找不到让所选值有效的方法，可以帮助一些人;）

由于

Answer 1

我认为您正在寻找options_from_collection_for_select而不是options_from_array_for_select，它会根据传递的集合为您创建一组<option></option>标记。

你可以这样下拉：

<%= f.select :tag_location, @domain.tag_location, {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true} %>

Answer 2

找到答案，不明白为什么，但它有效

<%= f.select :tag_location, options_from_array_for_select(@domain.tag_location, @card.tag_location), {:include_blank => "Escolha uma opção"} , {class: 'form-control', multiple: true} %>