Startrekzky commented on code in PR #5506:
URL: 
https://github.com/apache/incubator-devlake/pull/5506#discussion_r1232336350


##########
backend/helpers/pluginhelper/api/connection_helper.go:
##########
@@ -101,8 +104,16 @@ func (c *ConnectionApiHelper) List(connections 
interface{}) errors.Error {
 }
 
 // Delete connection
-func (c *ConnectionApiHelper) Delete(connection interface{}) errors.Error {
-       return CallDB(c.db.Delete, connection)
+func (c *ConnectionApiHelper) Delete(plugin string, connection interface{}) 
(*services.BlueprintProjectPairs, errors.Error) {
+       connectionId := reflectField(connection, "ID").Uint()
+       referencingBps, err := c.bpManager.GetBlueprintsByConnection(plugin, 
connectionId)
+       if err != nil {
+               return nil, err
+       }
+       if len(referencingBps) > 0 {
+               return services.NewBlueprintProjectPairs(referencingBps), 
errors.Conflict.New("Found one or more references to this connection")
+       }
+       return nil, CallDB(c.db.Delete, connection)

Review Comment:
   > also need to check if there are scopes referencing the connection
   
   @klesh I think we should allow users to delete a connection that has data 
scope(s), as long as the connection and its data scopes are not referenced by 
any project or bp.
   
   In this case, when deleting a connection, the frontend can loop the data 
scope(s) and delete both the data scopes under this connection and the 
connection itself.



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