legendary-doc-site/apps/auth/lib/auth/roles.ex

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defmodule Auth.Roles do
def has_role?(userlike, role) when is_atom(role), do: has_role?(userlike, Atom.to_string(role))
def has_role?(nil, _), do: false
def has_role?(user = %Auth.User{}, role) do
Enum.any?(user.roles, & &1 == role)
end
def has_role?(conn = %Plug.Conn{}, role) do
conn
|> Pow.Plug.current_user()
|> has_role?(role)
end
end