报名接口

app/controllers/trustie_hacks_controller.rb

@@ -36,6 +36,15 @@ class TrustieHacksController < ApplicationController
     render_ok
   end
 
+  def entry
+    if @hack.hack_users.exists?(user_id: current_user)
+      render_error('已经报名，请勿重复操作')
+    else
+      @hack.hack_users.create(user_id: current_user)
+      render_ok
+    end
+  end
+
 
   private
 

app/models/trustie_hack.rb

@@ -1,4 +1,9 @@
 class TrustieHack < ApplicationRecord
   has_many :hack_users, :dependent => :destroy
   belongs_to :trustie_hackathon, counter_cache: true
+
+
+  def entry_info(user_id)
+    hack_users.exists?(user_id: user_id)
+  end
 end

app/views/trustie_hacks/index.json.jbuilder

@@ -5,5 +5,6 @@ end
 
 json.hacks @hacks do |hack|
   json.(hack, :id, :name, :description, :hack_users_count)
+  json.entry_info hack.entry_info(current_user.id)
 end
 

config/routes.rb

@@ -880,7 +880,9 @@ Rails.application.routes.draw do
         get :edit_hackathon
         post :update_hackathon
       end
-
+      member do
+        post :entry
+      end
     end
   end
 

db/migrate/20191106061342_add_uniq_index_for_hack_users.rb

@@ -0,0 +1,5 @@
+class AddUniqIndexForHackUsers < ActiveRecord::Migration[5.2]
+  def change
+    add_index :hack_users, [:user_id, :trustie_hack_id], unique: true
+  end
+end