Preconditions from the tools are not respected

[Gelio]

• I have checked that this bug has not yet been reported by someone else
• I have checked that this bug appears on Chrome
• I have specified the version :

• other: 0.4.6

• I have specified my environment :

• Ubuntu 20.04 LTS

Screenshots

Edge Creation forbidden in Sirius Desktop, as expected (due to preconditions set to aql:false):

Peek.2021-10-17.16-46.mp4

It is allowed in Sirius Web (neither Start nor Complete conditions are checked):

Peek.2021-10-17.16-48.mp4

Steps to reproduce

Add Conneciton Start Precondition or Connection Complete Precondition to an Edge Creation Tool:

Expected behavior

1. The edge creation tool does not appear at all or appears but is disabled (when the Connection Start Precondition results in false)
2. The edge creation tool has the disabled icon when Connection Complete Precondition results in false

Actual behavior

Despite preconditions being false, the edge can be freely created, as if they were not taken into account.

[pcdavid]

Thanks for the detailed report. This is a known limitation at the moment.
We can not (easily) have the same interactive behavior as Sirius Desktop, as the expressions can only be evaluated on then backend, and getting the same behavior would required requests to the backend every time the end user moves the cursor on a different element.
We could probably however let the creation request pass to the backend but check for these before actually executing the tool, and report a message to the end-user if the tool was not applied because of these.

[Gelio]

We could probably however let the creation request pass to the backend but check for these before actually executing the tool, and report a message to the end-user if the tool was not applied because of these.

This sounds like a logical solution 👍

I understand it will take some time to implement and may not be a priority at the moment. Is there any way I can replicate this functionality (disallowing edges to be created under certain conditions) in Sirius Web?
I am in control of the metamodel and the Sirius Web app, so I can modify both and hardcode the condition somewhere.