实训迁移

db/migrate/20190622055449_modify_shixun_info_for_shixuns.rb

@@ -1,16 +1,18 @@
-class ModifyScriptAndDescriptionForShixuninfo < ActiveRecord::Migration[5.2]
+class ModifyShixunInfoForShixuns < ActiveRecord::Migration[5.2]
-  def change
+  def change
-    Shixun.find_each do |shixun|
+    Shixun.find_each do |shixun|
-      if shixun.shixun_info
+      if shixun.shixun_info
-        shixun.shixun_info.update_attributes(propaedeutics: shixun[:propaedeutics],
+        shixun.shixun_info.update_attributes(propaedeutics: shixun[:propaedeutics],
-                                             description: shixun[:description],
+                                             description: shixun[:description],
-                                             evaluate_script: shixun[:evaluate_script],
+                                             evaluate_script: shixun[:evaluate_script],
-                                             shixun_id: shixun[:id])
+                                             shixun_id: shixun[:id])
-      else
+      else
-        ShixunInfo.create!(propaedeutics: shixun[:propaedeutics], description: shixun[:description],
+        ShixunInfo.create!(propaedeutics: shixun[:propaedeutics], description: shixun[:description],
-                           evaluate_script: shixun[:evaluate_script], shixun_id: shixun.id)
+                           evaluate_script: shixun[:evaluate_script], shixun_id: shixun.id)
-      end
+      end
-    end
+    end
-    remove_columns :shixuns, :description, :propaedeutics, :evaluate_script
+    if shixun.description.present?
-  end
+      remove_columns :shixuns, :description, :propaedeutics, :evaluate_script
-end
+    end
+  end
+end