fixed：操作日志为空的情况

app/models/journal.rb

@@ -532,10 +532,10 @@ class Journal < ApplicationRecord
   def operate_content 
     content = "#{operate_by_content}"
     detail = self.journal_details.take
-    content = ""
     case detail.property
     when 'issue'
       content += "创建了<b>疑修</b>"
+      return content
     when 'attachment'
       old_value = Attachment.where("BINARY id in (?) or uuid in (?)", detail.old_value.to_s.split(","), detail.old_value.to_s.split(",")).pluck(:filename).join("、")
       new_value = Attachment.where("BINARY id in (?) or uuid in (?)", detail.value.to_s.split(","), detail.value.to_s.split(",")).pluck(:filename).join("、")
@@ -545,6 +545,7 @@ class Journal < ApplicationRecord
         new_value = "无" if new_value.blank?
         content += "将附件由<b>#{old_value}</b>更改为<b>#{new_value}</b>"
       end
+      return content
     when 'issue_tag'
       old_value = IssueTag.where(id: detail.old_value.split(",")).pluck(:name).join("、")
       new_value = IssueTag.where(id: detail.value.split(",")).pluck(:name).join("、")
@@ -554,6 +555,7 @@ class Journal < ApplicationRecord
         new_value = "无" if new_value.blank?
         content += "将标记由<b>#{old_value}</b>更改为<b>#{new_value}</b>"
       end
+      return content
     when 'assigner'
       old_value = User.where(id: detail.old_value.split(",")).map{|u| u.real_name}.join("、")
       new_value = User.where(id: detail.value.split(",")).map{|u| u.real_name}.join("、")
@@ -563,6 +565,7 @@ class Journal < ApplicationRecord
         new_value = "无" if new_value.blank?
         content += "将负责人由<b>#{old_value}</b>更改为<b>#{new_value}</b>"
       end
+      return content
     when 'attr'
       content += "将"
       case detail.prop_key
@@ -605,6 +608,7 @@ class Journal < ApplicationRecord
         new_value = "无" if new_value.blank?
         content += "由<b>#{old_value}</b>更改为<b>#{new_value}</b>"
       end
+      return content
     end
     content = self.pm_operate_content if content == ""
   end