Implements the has_cached_role? method to prevent N+1 issues - #369
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```ruby @user.add_role :admin, Forum @user.add_role :member, Forum users = User.with_role(:admin, Forum).preload(:roles) users.each do |user| user.has_cached_role?(:member, Forum) # no extra queries end ``` This method should be used with caution. If you don't preload the roles, the `has_cached_role?` might return `false`. In the above example, it would return `false` for `@user.has_cached_role?(:member, Forum)`, because `User.with_role(:admin, Forum)` will load only the `:admin` roles.
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wldcordeiro
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Implements the has_cached_role? method to prevent N+1 issues
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This method will take the preloaded roles and use ruby enumerable to check if user has the role without extra queries.
e.g: