[rails]'フォローを外す'機能が機能しない ＊エラーメッセージなし

Question

'フォローを外す'ボタンがエラーの発生なしに機能しません。'フォロ-'はできてフォロー数もカウントされています。
フォローを外すことができないので、indexのcardアイテムがすべてフォローされっぱなしになっています。

考えた手順として、
・destroyアクションがカラム(user_id,community_id)からデータを見つけられていない,

・フォローをすると、「フォローしたユーザーのid：user_id」と「フォローされたコミュニティのid：community_id」が

　「中間テーブル：followsテーブル」に保存されるはず,

followに関するデータがDBに保存されていないせいでdestroyのしようがないのかなと思いましたが、だからと言ってどうすれば良いのかもわからずじまいです。

何かご指摘願います。

<follows_controller.rb>

class FollowsController < ApplicationController


  def create
    @follow = current_user.follows.create(community_id:params[:community_id])
    redirect_back(fallback_location: root_path)
  end

  def destroy
    @community = Community.find(params[:community_id])
    @follow = current_user.follows.find_by(community_id: @community.id)
    @follow.destroy
    redirect_back(fallback_location: root_path)
  end
end

<index.html.erb>

<div class="container">
    <div class="row">
      <% @communities.each do |community| %>
         <div class="col-3">
            <%= link_to community_path(community) do %>
               <div class="card" style="width: 14rem;">
                  <div class="card-image">
                    <%= attachment_image_tag community, :intro_image, fallback:"no-image.jpg", class:"rounded-top" %>
                  </div>

                  <div class="card-body">
                    <%= community.title %>
                    <%= community.introduction%>
                  </div>

                  <% if current_user.present? && current_user.following?(community) %>
                    <%= link_to 'フォローを外す', community_follows_path(community), method: :destroy %>
                  <% else %>
                    <%= link_to 'フォロー', community_follows_path(community), method: :post %>
                  <%end%>
                  <%= community.follows.count %>
               </div>
            <%end%>
          </div>         　
       <%end%>
    </div>
</div>                          

<'フォロー'したときのトレース>

Started POST "/communities/4/follows" for ::1 at 2020-12-11 14:52:45 +0900
Processing by FollowsController#create as HTML
  Parameters: {"authenticity_token"=>"sguO8y1Evt0IGVqh44WM9EJsYaqwJ7tY36REpfoHlUCyiqdBMWGkMMin8157+m3MtmV5pfzN6LlggY5kmDigSg==", "community_id"=>"4"}
  User Load (0.2ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
  ↳ app/controllers/follows_controller.rb:5:in `create'
   (0.1ms)  begin transaction
  ↳ app/controllers/follows_controller.rb:5:in `create'
  Community Load (0.1ms)  SELECT "communities".* FROM "communities" WHERE "communities"."id" = ? LIMIT ?  [["id", 4], ["LIMIT", 1]]
  ↳ app/controllers/follows_controller.rb:5:in `create'
  Follow Exists? (0.1ms)  SELECT 1 AS one FROM "follows" WHERE "follows"."community_id" = ? AND "follows"."user_id" = ? LIMIT ?  [["community_id", 4], ["user_id", 1], ["LIMIT", 1]]
  ↳ app/controllers/follows_controller.rb:5:in `create'
  Follow Create (2.9ms)  INSERT INTO "follows" ("created_at", "updated_at", "user_id", "community_id") VALUES (?, ?, ?, ?)  [["created_at", "2020-12-11 05:52:45.484543"], ["updated_at", "2020-12-11 05:52:45.484543"], ["user_id", 1], ["community_id", 4]]
  ↳ app/controllers/follows_controller.rb:5:in `create'
   (0.7ms)  commit transaction
  ↳ app/controllers/follows_controller.rb:5:in `create'
Redirected to http://localhost:3000/communities.4
Completed 302 Found in 13ms (ActiveRecord: 4.1ms | Allocations: 6389)


Started GET "/communities.4" for ::1 at 2020-12-11 14:52:45 +0900
Processing by CommunitiesController#index as 
  Rendering communities/index.html.erb within layouts/application
  Community Load (0.1ms)  SELECT "communities".* FROM "communities"
  ↳ app/views/communities/index.html.erb:3
  User Load (0.1ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
  ↳ app/views/communities/index.html.erb:14
  Follow Exists? (0.2ms)  SELECT 1 AS one FROM "follows" WHERE "follows"."user_id" = ? AND "follows"."community_id" = ? LIMIT ?  [["user_id", 1], ["community_id", 1], ["LIMIT", 1]]
  ↳ app/models/user.rb:11:in `following?'
   (0.2ms)  SELECT COUNT(*) FROM "follows" WHERE "follows"."community_id" = ?  [["community_id", 1]]
  ↳ app/views/communities/index.html.erb:19
  Follow Exists? (0.1ms)  SELECT 1 AS one FROM "follows" WHERE "follows"."user_id" = ? AND "follows"."community_id" = ? LIMIT ?  [["user_id", 1], ["community_id", 2], ["LIMIT", 1]]
  ↳ app/models/user.rb:11:in `following?'
   (0.1ms)  SELECT COUNT(*) FROM "follows" WHERE "follows"."community_id" = ?  [["community_id", 2]]
  ↳ app/views/communities/index.html.erb:19
  Follow Exists? (0.1ms)  SELECT 1 AS one FROM "follows" WHERE "follows"."user_id" = ? AND "follows"."community_id" = ? LIMIT ?  [["user_id", 1], ["community_id", 3], ["LIMIT", 1]]
  ↳ app/models/user.rb:11:in `following?'
   (0.1ms)  SELECT COUNT(*) FROM "follows" WHERE "follows"."community_id" = ?  [["community_id", 3]]
  ↳ app/views/communities/index.html.erb:19
  Follow Exists? (0.2ms)  SELECT 1 AS one FROM "follows" WHERE "follows"."user_id" = ? AND "follows"."community_id" = ? LIMIT ?  [["user_id", 1], ["community_id", 4], ["LIMIT", 1]]
  ↳ app/models/user.rb:11:in `following?'
 (0.3ms)  SELECT COUNT(*) FROM "follows" WHERE "follows"."community_id" = ?  [["community_id", 4]]
  ↳ app/views/communities/index.html.erb:19
  Rendered communities/index.html.erb within layouts/application (Duration: 15.8ms | Allocations: 9268)
[Webpacker] Everything's up-to-date. Nothing to do
Completed 200 OK in 33ms (Views: 30.5ms | ActiveRecord: 1.5ms | Allocations: 16698)

Answer 1

link_to の method が destroy になってますが、deleteじゃないかと思います。

# :destroyを
<%= link_to 'フォローを外す', community_follows_path(community), method: :destroy %>
# :deleteに変更
<%= link_to 'フォローを外す', community_follows_path(community), method: :delete %>

Comments

[YutoKubo]

無事解決しました! なぜdestroyではだめなのでしょうか?

[YutoKubo]

このmethodには①GET, ②POST, ③PUT, ④DELETEHTTP4つのメソッドというものの中から指定する必要があるようですね。

[neko_daisuki]

そうです。
$ rails routes したときの Verb の欄に出てくるやつです。

ちなみに :destroy と書くと post になるみたいですね。