ruby-on-rails - 如何在 rails json 响应中合并对象中的另一个字段

Question

我发送的Json响应是这样的

"ad": {
"id": 3,
"title": "dgdfg",
"description": "kjlj",
"video_file_name": "SampleVideo_1080x720_1mb.mp4",
"thumbnail_file_name": "images.jpeg",
"campaign_id": null,
"duration": null
},

"video_url": "/system/ads/videos/000/000/003/original/SampleVideo_1080x720_1mb.mp4?1448019186"

我希望 video_url 也与广告对象合并。

我现在发送响应的方式是

render json: {:success=>true, :message=>"Ad detail",:ad=>@ad, :video_url => @ad.video.url}, :status=>200

如何将它与广告对象合并？

我想发个赞

"ad": {
"id": 3,
"title": "dgdfg",
"description": "kjlj",
"video_file_name": "SampleVideo_1080x720_1mb.mp4",
"thumbnail_file_name": "images.jpeg",
"campaign_id": null,
"duration": null,
"video_url": "/system/ads/videos/000/000/003/original/SampleVideo_1080x720_1mb.mp4?1448019186"

 }

我的@ad对象是

#<Ad:0x007efc20495f98
id: 3,
title: "dgdfg",
description: "kjlj",
video_file_name: "SampleVideo_1080x720_1mb.mp4",
video_content_type: "video/mp4",
video_file_size: 1055736,
video_updated_at: Fri, 20 Nov 2015 11:33:06 UTC +00:00,
thumbnail_file_name: "images.jpeg",
thumbnail_content_type: "image/jpeg",
thumbnail_file_size: 9962,
thumbnail_updated_at: Fri, 20 Nov 2015 11:33:22 UTC +00:00,
created_at: Fri, 20 Nov 2015 11:33:22 UTC +00:00,
updated_at: Fri, 20 Nov 2015 11:33:22 UTC +00:00,
campaign_id: nil,
duration: nil>

Answer 1

首先将 {:video_url => @ad.video.url } 与 @ad 合并，然后执行以下操作:

{:ad =>  @ad.attributes.merge( :video_url => @ad.video.url )}

因此您的渲染调用如下所示:

render json: {:success=>true, :message=>"Ad detail", ad:  @ad.attributes.merge( :video_url => @ad.video.url )}, :status=>200  

如果您不需要事件记录对象的某些属性，您可能需要在以下代码中使用 @ad.attributes.except("created_at",....) @广告。