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[初心者log]Rails API 複数Modelの情報をjson型で返す方法

Posted at

#本記事の目的
Rails(APIモード) + Reactで開発をしている最中、Post一覧表示にUserのAvatarを付与したいと考え、やり方を調べたのでまとめます。

##失敗例

posts_controller.rb
class PostController < ApplicationController

def index
   posts = Post.all
   hash = {}
   posts.each{|post|
     hash[post.id] = {post: post, user: post.user}
   }
   render json: { status: 200, posts: hash }
 end

#以下略

これだと返ってくる値がハッシュになり、React側で

posts.length > ? (
  //処理1
  ) : (
  //処理2
  )

といった記述ができなくなります。

###成功例

posts_controller.rb
class PostController < ApplicationController

def index
    posts = Post.all
    array = []
    posts.each{|post|
      array.push({post: post, user: post.user})
    }
    render json: { status: 200, posts: array }
  end

配列型にしてそこにpushすればReact側での処理もスムーズに進みました。

N+1問題についてはまた次回まとめてみようと思います。

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