Question

我有一个提交模型

belongs_to :report
has_many :answers

报告模型

has_many :questions

问题模型

has_many :answers   # answer has submission_id

现在在rabl模板中我需要像这样输出

        object @submission
        attributes :status, :submission_time

        child :report do
            attribute :id, :name
            child :questions do
                attribute :id, :content
                node(:answers_count) do |question|
                    question.answers.where("submission_id = ?", @submission.id).count
                end
                node(:answers) do |question|
                    question.answers.where("submission_id = ?", @submission.id).collect{ |answer| {:name => answer.name, :id => answer.id}}
                end
            end
        end

这工作得很好，但问题出在answers_count和答案节点我正在使用@submission，因为该索引操作不起作用。

它在show动作中很好，但索引动作正在创建问题，因为@submission在索引操作中不可用。

PS：一旦我解决了这个问题，我会将大查询从视图移动到模型。我知道，为了简单起见，我已粘贴内联。

Answer 1

这不是最佳解决方案，但可以正常使用

object @submission
attributes :status, :submission_time

child :report do
    attribute :id, :name

    submission_id = locals['submission'] ? locals['submission'].id : locals[:object].id

    child :questions do
        attribute :id, :content
        node(:answers_count) do |question|
            question.answers.where("submission_id = ?", submission_id ).count
        end
        node(:answers) do |question|
            question.answers.where("submission_id = ?", submission_id ).collect{ |answer| {:name => answer.name, :id => answer.id}}
        end

    end
end

Answer 2

这应该对你有用，虽然这肯定是一个黑客攻击。我为下属保留了以下非工作解决方案：

object @submission
attributes :status, :submission_time

child :report do
    submission_id = root_object.id
    attribute :id, :name
    child :questions do
        attribute :id, :content
        node(:answers_count) do |question|
            question.answers.where("submission_id = ?", submission_id).count
        end
        node(:answers) do |question|
            question.answers.where("submission_id = ?", submission_id).collect{ |answer| {:name => answer.name, :id => answer.id}}
        end
    end
end

不正确的解决方案：

使用root_object：

node(:answers_count) do |question|
  question.answers.where("submission_id = ?", root_object.id).count
end

或者，将其作为参数传递给child :report块：

    object @submission
    attributes :status, :submission_time

    child :report do |submission|
        attribute :id, :name
        child :questions do
            attribute :id, :content
            node(:answers_count) do |question|
                question.answers.where("submission_id = ?", submission.id).count
            end
            node(:answers) do |question|
                question.answers.where("submission_id = ?", submission.id).collect{ |answer| {:name => answer.name, :id => answer.id}}
            end
        end
    end

不幸的是，这些方法都不奏效。第一个解决方案不起作用，因为root_object随块范围一起更改（它标识包含块的父级）。第二个解决方案不起作用，因为与node不同，child传递了该迭代的子对象。不幸的是，这与你认为的the documentation相反。

在rabl模板中访问父对象

2 个答案: