ConceptService concept creation

Development
1

I am facing this weird error when i am creating concepts using a recursive utility which reads from a csv file. The scenario is as follows:

Concept A has two child answers B and C present in the file .

When A is being loaded, it can’t find B and C, hence i make a recursive call to store B and C. when the recursive call returns to the parent, i get an error the child don’t exist yet.

During the recursive calls made to B and C, after the are created. I check using conceptService.getConceptbyuuid() to see whether B and C exist and they do. But when the call returns to parent, the children don’t exist.

I tried flushing the session as soon as i create concepts. But it still doesn’t work. I am using ConceptService.SaveConcept(concept) to save a concept.

Any pointers would be really helpful.

2

Can you try instantiating the children, don’t save them separately instead add them to the parent and save the parent, the save should cascade to the children.

3

Thanks for the reply. I tried doing that but when it comes back to the parent concept, it tries to add answers and since answers are not yet saved, it gives a null pointer exception.

4

I’m not sure how you are doing it, can you please share you code so we can take a look?

5

Hi,

I was able to debug the problem. It was a code issue. Thanks a lot for your help.

6

Great! Can you please give more details of what the actual issue was and how you solved it, it can be very useful in the future for somebody else running into a similar issue.

7

Sure. Changed the approach. i just iterated thru the datastructure twice. First time i create concepts and second time i add answers.

File:

Parent -> Child

A -> (B,C)

B->()

C->()

In the first iteration. I ignore the concept answers, so just create A,B and C line by line. Iteration 2, i connect answers to the parent. since all concepts are present by this time.

8

Makes sense, thanks!