fix(scale_result): 使用测量结果中的timestamp显示测量时间，移除更新时间字段

app/models/scale_result.rb

@@ -15,6 +15,19 @@ class ScaleResult < ActiveRecord::Base
     contact.blank? ? "-" : contact
   end
 
+  # 从测量结果中获取时间戳
+  def measurement_time
+    return nil if result.blank?
+    begin
+      data = JSON.parse(result)
+      timestamp = data['timestamp']
+      return nil if timestamp.blank?
+      Time.parse(timestamp)
+    rescue => e
+      nil
+    end
+  end
+
   rails_admin do
     navigation_label '测量记录'
     parent ScaleDevice
@@ -43,11 +56,13 @@ class ScaleResult < ActiveRecord::Base
       field :result do
         label '测量结果'
       end
-      field :created_at do
-        label '创建时间'
-      end
-      field :updated_at do
-        label '更新时间'
+      field :measurement_time do
+        label '测量时间'
+        pretty_value do
+          time = bindings[:object].measurement_time
+          time.present? ? time.strftime('%Y-%m-%d %H:%M:%S') : '-'
+        end
+        sortable false
       end
     end
 
@@ -73,11 +88,12 @@ class ScaleResult < ActiveRecord::Base
       field :result do
         label '测量结果'
       end
-      field :created_at do
-        label '创建时间'
-      end
-      field :updated_at do
-        label '更新时间'
+      field :measurement_time do
+        label '测量时间'
+        pretty_value do
+          time = bindings[:object].measurement_time
+          time.present? ? time.strftime('%Y-%m-%d %H:%M:%S') : '-'
+        end
       end
     end
 
@@ -91,12 +107,6 @@ class ScaleResult < ActiveRecord::Base
       field :result do
         label '测量结果'
       end
-      field :created_at do
-        label '创建时间'
-      end
-      field :updated_at do
-        label '更新时间'
-      end
     end
   end
 end