贴吧调整

db/migrate/20190801075337_add_praises_count_to_memos.rb

@@ -0,0 +1,12 @@
+class AddPraisesCountToMemos < ActiveRecord::Migration[5.2]
+  def change
+    add_column :memos, :praises_count, :integer, :default => 0
+
+    memos = Memo.includes(:praise_treads).all
+    memos.find_each do |m|
+      puts("####{m.id}")
+      praises_count = m.praise_treads.select{|pt| pt.praise_or_tread == 1}.count
+      m.update_column(:praises_count, praises_count)
+    end
+  end
+end