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December 15, 2015 21:19
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| class PostPolicy < Struct.new(:user, :post) | |
| def update? | |
| post.user == user | |
| end | |
| def destroy? | |
| false | |
| end | |
| def show? | |
| true | |
| end | |
| end | |
| class Ability | |
| include CanCan::Ability | |
| def initialize(user) | |
| @user = user || User.new | |
| can do |action, object| | |
| policy(object).send_public(policy_method(action)) | |
| end | |
| end | |
| def policy_method(action) | |
| "#{action}?" | |
| end | |
| def policy(object) | |
| find_policy(object).new(@user, object) | |
| end | |
| def find_policy(object) | |
| if object.respond_to?(:policy_class) | |
| object.policy_class | |
| elsif object.class.respond_to?(:policy_class) | |
| object.class.policy_class | |
| else | |
| model = if object.respond_to?(:model_name) | |
| object.model_name | |
| elsif object.class.respond_to?(:model_name) | |
| object.class.model_name | |
| elsif object.is_a?(Class) | |
| object | |
| else | |
| object.class | |
| end | |
| Object.const_get("#{model}Policy") | |
| end | |
| end | |
| end |
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