init project

app/models/trustie_hack.rb

@@ -0,0 +1,10 @@
+class TrustieHack < ApplicationRecord
+  validates_length_of :description, maximum: 500, message: "不能超过500个字符"
+  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