Question

Passing a two entities to a microflow to create an association.

0

Hello, I have a domain model with exam entity and question entity where many questions can associate with one exam. I have a way of creating questions in an exam, but what I hoped to do next was create a question pool, where I can multi-select unassociated questions in a data grid to associate with an existing exam. So I imagined a drop down choice of an exam to select and then a multi-select of questions on the page, and then being able to press a button to pass the selected exam and list of selected questions to a microflow to associate the questions with the exam. I think the microflow will have to accept two input paramaters (the exam and the list of questions) but I can't see a way of passing both an exam and list of questions from a page. I can only see how to pass one parameter. Please does anyone know a way of achieving this, if it is possible in Mendix? Thanks, Alex

asked 2017-10-05

Alex Holehouse

2 answers

Mike Kumpf · Answer 1 · 2017-10-05

Alex,

One thing that's not clear from your question is whether a given question can appear on more than one exam - if so, that would mean the association between Exam and Question entities would need to many to many.

If that's your domain model, you can do this with a standard Mendix page without the need for a microflow. Create a Master Detail page using the new page wizard. The Master would be a list of Exams, the detail would contain a Reference Set Selector of the questions for the selected Exam. Just be sure to commit changes when the question list is changed for an Exam.

Hope that helps,

Mike

Alex Holehouse · Answer 2 · 2017-10-05

Hi Mike,

Thanks for your answer. I have it so a question can only appear in one exam, with the domain model a one-to-many, so I would use the pool to disassociate from an existing exam and then associate unassociated questions to a new exam. As someone would only be given a second exam if they fail the first so I don't want to allow the same questions in multiple exams.

I was trying things in the meantime since and found a way which works. Having a datagrid of exams from database, then below it a dataview listening to the exam datagrid. Then within that dataview a datagrid of questions from database.

So I can select an exam then multi-select questions and press a button in the question datagrid which calls my microflows and passes both the exam and question list as paramaters.

Thanks
Alex