View log

ir/model.py

@@ -1538,6 +1538,10 @@ class Log(ResourceAccessMixin, ModelSQL, ModelView):
             })
     action = fields.Function(
         fields.Char("Action"), 'get_action', searcher='search_action')
+    old_values = fields.Text("Old Values", readonly=True)
+    new_values = fields.Text("New Values", readonly=True)
+    change_summary = fields.Function(
+        fields.Text("Changes"), 'get_change_summary')
 
     @classmethod
     def __setup__(cls):
@@ -1583,6 +1587,53 @@ class Log(ResourceAccessMixin, ModelSQL, ModelView):
                 return f'{field_name} : {state}'
         return self.target
 
+    @staticmethod
+    def _load_change_values(value):
+        if not value:
+            return {}
+        try:
+            return json.loads(value)
+        except (TypeError, ValueError):
+            return {}
+
+    @staticmethod
+    def _format_change_value(value):
+        if isinstance(value, list):
+            if len(value) > 6:
+                return '[%s items]' % len(value)
+            return ', '.join(Log._format_change_value(v) for v in value)
+        if isinstance(value, dict):
+            return json.dumps(value, sort_keys=True, ensure_ascii=False)
+        if value in (None, ''):
+            return ''
+        return str(value)
+
+    def get_change_summary(self, name):
+        if self.event != 'write':
+            return ''
+        old_values = self._load_change_values(self.old_values)
+        new_values = self._load_change_values(self.new_values)
+        if not old_values and not new_values:
+            return ''
+        pool = Pool()
+        Field = pool.get('ir.model.field')
+        model = self.resource.__name__ if self.resource else None
+        lines = []
+        for field_name in sorted(set(old_values) | set(new_values)):
+            old_value = old_values.get(field_name)
+            new_value = new_values.get(field_name)
+            if old_value == new_value:
+                continue
+            if model:
+                field_label = Field.get_name(model, field_name)
+            else:
+                field_label = field_name
+            lines.append('%s: %s -> %s' % (
+                    field_label,
+                    self._format_change_value(old_value),
+                    self._format_change_value(new_value)))
+        return '\n'.join(lines)
+
     @classmethod
     def search_action(cls, name, clause):
         return [('target', *clause[1:])]

ir/view/model_log_form.xml

@@ -13,4 +13,10 @@ this repository contains the full copyright notices and license terms. -->
         <field name="event"/>
         <field name="action"/>
     </group>
+    <label name="change_summary"/>
+    <field name="change_summary"/>
+    <label name="old_values"/>
+    <field name="old_values"/>
+    <label name="new_values"/>
+    <field name="new_values"/>
 </form>

ir/view/model_log_list.xml

@@ -8,4 +8,5 @@ this repository contains the full copyright notices and license terms. -->
     <field name="user" expand="1"/>
     <field name="event"/>
     <field name="action" expand="1"/>
+    <field name="change_summary" optional="1"/>
 </tree>