I have a rails app where in a form, I have a form select (drop down list). For example the user can select from 1,2,3,4,5
我有一个rails应用程序，在表单中，我有一个表单选择（下拉列表）。例如，用户可以从1,2,3,4,5中进行选择
Say for example I had these values stored in an array as an instance variable like:
比方说，我将这些值存储在数组中作为实例变量，如：
@formlist = [1,2,3,4,5]
@formlist = [1,2,3,4,5]
How can I simply put the array into the form select helper rather than listing each item separately. At the moment my code is:
我怎样才能简单地将数组放入表单选择助手中，而不是单独列出每个项目。目前我的代码是：
<tr> <th><%= f.label(:heat_level, "Heat Level") %></th> <td><%= f.select(:heat_level,{ 1 => "1", 2 => "2", 3 => "3", 4 => "4", 5 => "5"}) %></td> </tr>
1 个解决方案
#1
14
this should work:
这应该工作：
f.select(:heat_level, @formlist.map { |value| [ value, value ] })
some explanation:
一些解释：
form select can handle both hash-like and array-like options list. Meaning, both { 1 => "1", 2 => "2", 3 => "3", 4 => "4", 5 => "5"}
表单选择可以处理类似哈希和类似数组的选项列表。含义，{1 =>“1”，2 =>“2”，3 =>“3”，4 =>“4”，5 =>“5”}
and
和
[[1, 1], [2, 2], [3, 3], [4, 4], [5, 5]]
[[1,1]，[2,2]，[3,3]，[4,4]，[5,5]]
will work.
将工作。
@formlist.map { |value| [ value, value ] } does the latter
@ formlist.map {| value | [value，value]}做后者
#1
14
this should work:
这应该工作：
f.select(:heat_level, @formlist.map { |value| [ value, value ] })
some explanation:
一些解释：
form select can handle both hash-like and array-like options list. Meaning, both { 1 => "1", 2 => "2", 3 => "3", 4 => "4", 5 => "5"}
表单选择可以处理类似哈希和类似数组的选项列表。含义，{1 =>“1”，2 =>“2”，3 =>“3”，4 =>“4”，5 =>“5”}
and
和
[[1, 1], [2, 2], [3, 3], [4, 4], [5, 5]]
[[1,1]，[2,2]，[3,3]，[4,4]，[5,5]]
will work.
将工作。
@formlist.map { |value| [ value, value ] } does the latter
@ formlist.map {| value | [value，value]}做后者