Ruby on rails activeadmin下拉列表使用帮助器方法将值传递给集合

如何使用show页面上的helper方法来显示apple而不是op1

此示例使用帮助器方法将值传递给集合。
“op1”保存在db中，“apple”显示在下拉列表中

app/admin/example.rb

form do
  f.input :name, :as => :select, :collection => test_method
end 

show do
   attributes_table_for example do
       row("Name") { example.name }
   end
end

def test_method
   hash = {"apple"  => "op1",
           "orange" => "op2",
           "berry"  => "op3"}
   hash
end

示例\u helper.rb

form do
  f.input :name, :as => :select, :collection => test_method
end 

show do
   attributes_table_for example do
       row("Name") { example.name }
   end
end

def test_method
   hash = {"apple"  => "op1",
           "orange" => "op2",
           "berry"  => "op3"}
   hash
end

---

我将把hash变量作为常量放在ActiveRecord模型中。然后您可以使用：

attributes_table_for example do
       row("Name") { MyModel::HASH_CONSTANT[example.name.to_sym] }
   end

---

散列应该是

op1:“apple”

对，而不是

“apple”=>“op1”

如何将散列转换为下拉列表的符号collection=>MyModel:：HASH_CONSTANTMyModel:：HASH_CONSTANT.map{| key，value |[value，key]}