数组 – Rails – grouped_options_for_select
发布时间:2020-12-17 01:47:47 所属栏目:百科 来源:网络整理
导读:我在使用groups_options_for_select填充选项组的Rails中的选择框时遇到一些困难. 我目前有3个实例变量,我想将其添加到分组选择框的一个整个分组数组中. 例如,我有: @fruits (which contains the object(s)) --- !ruby/object:Fruits attributes: id: 2 name
我在使用groups_options_for_select填充选项组的Rails中的选择框时遇到一些困难.
我目前有3个实例变量,我想将其添加到分组选择框的一个整个分组数组中. 例如,我有: @fruits (which contains the object(s)) --- !ruby/object:Fruits attributes: id: 2 name: Banana @veggies (which contains the object(s)) --- !ruby/object:Veggies attributes: id: 23 name: Celery --- !ruby/object:Veggies attributes: id: 24 name: Carrots @junk_food (which contains the object(s)) --- !ruby/object:Junk attributes: id: 11 name: Snickers --- !ruby/object:Junk attributes: id: 12 name: Ice Cream 我的问题是:如何将这3个实例变量转换为分组选择,如: <select> <optgroup label="Fruits"> <option value="2">Banana</option> </optgroup> <optgroup label="Veggies"> <option value="23">Celery</option> <option value="24">Carrots</option> </optgroup> <optgroup label="Junk"> <option value="11">Snickers</option> <option value="12">Ice Cream</option> </optgroup> </select> food_controller.erb @fruits = Fruit.all @veggies = Veggies.all @junk_food = JunkFood.all # Then,I'd create the array here using the items above? 我知道我应该使用grouped_items_for_select,但我继续遇到一堆错误,我不确定这样做的正确方法. 解决方法
grouped_options_for_select方法确实是正确的.
由于您尚未提供代码,因此应该会产生所需的分组选项: grouped_options_for_select [['Fruits',@fruits.collect {|v| [ v.name,v.id ] }],['Veggies',@veggies.collect {|v| [ v.name,['Junk',@junk_food.collect {|v| [ v.name,v.id ] }]] 哪个可用于创建下拉列表: select_tag 'Food',grouped_options_for_select(...) 或者使用form_helper: f.select :food_attribute,grouped_options_for_select(...) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |