ruby-on-rails-3.2 - How to return string of role names with rolify

Question

I'm trying to return the name of all the roles a user has in the following format:

'rolename1','rolename2','rolename3'

So that I can user the has_all_roles? method from rolify.

I've tried collecting the role names like this:

user.roles(:select => :name).collect(&:name)

But that returns an array:

["rolename1","rolename2","rolename3"]

the has_all_roles? method wants them like this:

user.has_all_roles?('rolename1','rolename2','rolename3')

I'm sure I'm missing something very simple.

Answer 1

将收集的结果捕获到变量中，并将捕获的数组转换为参数列表。

roles = user.roles(:select => :name).collect(&:name)
user.has_all_roles?(*roles)

Answer 2

从 Rails 5.1 开始，该方法user.roles(:select => :name)会为您提供以下错误：

ArgumentError: wrong number of arguments (1 for 0)

要修复它，我们可以这样做@user.roles.pluck(:name)。

如果你想要一个串联名称逗号分隔的字符串，我们可以这样做@user.roles.pluck(:name).join(", ")