具有嵌套资源和 :find_by 的 CanCan gem

Question

我使用 CanCan load_and_authorize_resource 辅助方法来获取资源和生成授权，但我有一个这样的嵌套资源

load_and_authorize_resource :company
load_and_authorize_resource :accountings, :through => :company, :class => 'Departments::Accounting'

但我需要 @accountings 由另一个属性而不是 Departmets::Accounting id 找到，并为该属性赋值，例如

@accountings = @company.find_by_period_id(@period.id)

Answer 1

您可以通过两个额外的选项来做到这一点：

load_and_authorize_resource :accountings,
    :through => :company, :class => 'Departments::Accounting',
    :find_by => :attr, # :period_id in your example
    :id_param => :something # this searches the params hash for
                            # params[:something], and sends that
                            # value to .find_by_attr

检查load_and_authorize_resourcehere的代码。