验证 HABTM 复选框
我有多个来自多对多关系的复选框，并且我正在尝试验证它们，以便所有字段都不需要值才能继续。目前，如果我尝试创建一个用户，而不通过复选框将其分配给组/角色，我也会得到
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each
同样的信息，当分配了组但所有其他字段都留空时，我仍然会收到上述错误。
当一切都有价值时，它就会完美地运作。
下面的表格
I have multiple check boxes from a many to many relationship, And i'm trying to validate them so that none of the fields need a value to continue. At the moment if i try to create a user without assigning them to a group/role through the checkboxes i get
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each
Also when a group is assigned but all other fields are left empty i still get the above error.
When everything has a value it works perfectly.
Form below
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如果未选中所有复选框，请使用空数组
如果仍然存在问题，则需要在此处复制粘贴控制器代码
use the empty array if all checkboxes unchecked
if you still have the issue, you need to copy-paste your controller code here