JSON没有嵌套在Rails视图中 [英] JSON is not nested in rails view

问题描述

我有几个层次结构模型，每个级别有1:许多.每个类仅与上面的类和下面的类关联，即:

I have a several models in a heirarchy, 1:many at each level. Each class is associated only with the class above it and the one below it, ie:

L1课程， L2单元 L3单元布局， L4布局字段 L5表字段(不在代码中，而是同级的布局字段)

L1 course, L2 unit, L3 unit layout, L4 layout fields, L5 table fields (not in code, but a sibling of layout fields)

我正在尝试构建整个层次结构的JSON响应.

I am trying to build a JSON response of the entire hierarchy.

def show
    @course = Course.find(params[:id])
    respond_to do |format|
      format.html # show.html.erb
      format.json do
        @course = Course.find(params[:id])
        @units = @course.units.all
        @unit_layouts = UnitLayout.where(:unit_id => @units)
        @layout_fields = LayoutField.where(:unit_layout_id => @unit_layouts)
        response = {:course => @course, :units => @units, :unit_layouts => @unit_layouts, :layout_fields => @layout_fields}
        respond_to do |format|
          format.json {render :json => response }
        end
      end
    end
  end

代码将带回正确的值，但是在使用过程中，单位，unit_layouts和layout_fields都嵌套在同一级别.我希望它们被嵌套在其父内部.

The code is bring back the correct values, but the units, unit_layouts and layout_fields are all nested at the same level under course. I would like them to be nested inside their parent.

推荐答案

您需要使用 和:include来包含相关记录.

You need to use to_json with :include to include the associated records.

在这里刺伤

@course = Course.find(params[:id])

respond_to do |format|
  format.html # show.html.erb
  format.json do
    render :json => @course.to_json(:include => { :units => { :include => :layouts } })
  end
end

这可能不是100％正确的，因为您没有包括协会的所有名称，但是我假设Unit has_many Layouts.要包含更深层的嵌套，请添加其他嵌套的:include.

It's probably not 100% correct, because you haven't included all the names of your associations, but I'm assuming that Unit has_many Layouts. To include the deeper nesting, add additional nested :includes.

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