feat: printing module

stateflow/admin.py

@@ -7,6 +7,18 @@ from . import models
 class StateParameterInline(admin.StackedInline):
     model = models.StateParameter
     extra = 1
+    fields = ('key', 'value', 'attachment', 'description')
+    readonly_fields = ('attachment_preview',)
+    
+    def attachment_preview(self, obj):
+        """显示附件预览"""
+        if obj.attachment:
+            if obj.attachment.name.lower().endswith(('.png', '.jpg', '.jpeg', '.gif', '.bmp', '.webp')):
+                return mark_safe(f'<img src="{obj.attachment.url}" style="max-width: 200px; max-height: 200px;" />')
+            else:
+                return mark_safe(f'<a href="{obj.attachment.url}" target="_blank">查看附件</a>')
+        return "-"
+    attachment_preview.short_description = '附件预览'
 
 
 class ProcessNodeInline(admin.StackedInline):
@@ -34,10 +46,15 @@ class StateAdmin(admin.ModelAdmin):
     def parameter_overview(self, obj: models.State):
         params = obj.parameters.all()
         if params:
-            result = "<br>".join([f"{param.key}={param.value}" for param in params])
+            result = []
+            for param in params:
+                param_str = f"{param.key}={param.value}"
+                if param.attachment:
+                    param_str += f' <a href="{param.attachment.url}" target="_blank">📎</a>'
+                result.append(param_str)
+            return mark_safe("<br>".join(result))
         else:
-            result = "-"
-        return mark_safe(result)
+            return "-"
 
 
 @admin.register(models.Process)
@@ -81,7 +98,7 @@ class BusinessObjectAdmin(admin.ModelAdmin):
     )
     search_fields = ('name', 'description')
     list_filter = ('process', 'created_at', 'updated_at')
-    actions = ['advance_to_next_state_action', 'reset_progress_action']
+    actions = ['advance_to_next_state_action', 'step_back_one_state_action', 'reset_progress_action']
     autocomplete_fields = ('process',)
     inlines = [StateFlowRecordInline]
     fieldsets = [
@@ -115,6 +132,20 @@ class BusinessObjectAdmin(admin.ModelAdmin):
         
         self.message_user(request, f'成功推进 {success_count}/{queryset.count()} 个业务对象。详情: {"; ".join(messages[:5])}')
 
+    @action(description='回退一步')
+    def step_back_one_state_action(self, request, queryset):
+        from . import services
+        success_count = 0
+        messages = []
+        
+        for obj in queryset:
+            success, message = services.step_back_one_state(obj, request.user)
+            if success:
+                success_count += 1
+            messages.append(f"{obj.name}: {message}")
+        
+        self.message_user(request, f'成功回退 {success_count}/{queryset.count()} 个业务对象。详情: {"; ".join(messages[:5])}')
+
     @action(description='重置进度')
     def reset_progress_action(self, request, queryset):
         from . import services