Ruby CanCanCan 动态定义方法

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灵感来自这里https://github.com/kristianmandrup/cantango/wiki/CanCan-vs-CanTango

如果权限不多，我们可以通过这种方式来定义

class CanCan::Abilitydef initialize user, options = {}if !usercan :read, :allendif useradmin_rules if user.roles.include? :admineditor_rules if user.roles.include? :editordefault_rulesendenddef admin_rulescan :manage, :allenddef editor_rulescan :manage, [Article, Post]end
end

改的灵活点

class CanCan::Abilitydef initialize user, options = {}user ? user_rules : guest_user_rulesenddef user_rulesuser.roles.each do |role|exec_role_rules(role) if user.roles.include? roleenddefault_rulesenddef exec_role_rules rolemeth = :"#{role}_rules"send(meth) if respond_to? methend# various rules methods for each roledef admin_rulescan :manage, :allenddef editor_rulescan :manage, [Article, Post]end...def default_rulescan :read, :allend
end

上面是原文出处，实际使用的时候还是不方便，我改成这样了（非一比一还原）。使用define_method 定义那个每个方法：

class Abilityinclude CanCan::Ability@@permissions = xxxdef initialize(user)@user= user|| User.new@user.roles.each do |role|exec_role_rules(role) if @user.has_role?(role)endendRole.all.each do |role|define_method "rules_#{role.name.gsub(" ", "_")}" dorole_permissions = RolePermission.where(role_id: role.id)unless role_permissions.blank?role_permissions.each do |rp|permission_value = @@permissions[rp.permission_key]entities = permission_value["entities"].map{|e| e.constantize}actions = permission_value["actions"].map{|e| e.to_sym}can actions, entitiesendendendenddef exec_role_rules(role)meth = :"rules_#{role.name.gsub(" ", "_")}"send(meth) if respond_to? methendend

经测试嘎嘎好用，就是我还需要添加一些条件筛选，导致我这个不能用，得删掉，有点可惜，记录一下~

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