cervantes | Source code for the Cervantes ereader application | Media library

This is because you are using the @EqualsAndHashCode Lombok annotation. There is an error (possibly recursive, since your stack trace is large, I am not sure) when getting the hashcode of the Review JPA entity.

The Lombok auto-generated hashcode method in Review entity will call the Book entity, which tries to get the hashcode of the Set of Reviews. This Set needs to be initialized first before it can be read.

This is executing it before the click:
:class="{'text-white bg-success' : checkAnswer(answer)}".
You'll need to keep the state in a variable for each answer and update it within the method. And as a side node, it is recommended to use :key for looped elements.

The having clause is executed after aggregation. And you have only one column -- the count, not the created.

You want a where clause:

Issue: You face this data missing issue because of asynchronous calls.

Solution: In django.test there is a test class called TransactionTestCase. By using this we can overcome that asynchronous data missing issue.

Make following changes and you are all set to go:

Replace TestCase with TransactionTestCase and you are all set to go.

adding book[0].parent() will do the trick

Your actual XML probably has more than one alumno with different ids. So you need to concat at each alumno level separately (and add spaces). Try

Sounds like you are asking for help on how to get started. You are asking for help on learning to learn. Here is how I would approach your problem:

Apparently you are supposed to use a priority queue.

1. Write a tiny program that makes a priority queue and stores strings into it, then prints them out.
2. Define a class and store instances of that class into the priority queue instead of strings.
3. Modify the sort criteria on the priority queue and notice that the printed sequence changes according to the sort criteria.
4. Write a function that creates one class instance with random values.
5. Write a function that creates all 100 class instances.
6. Declare victory.

First you need to wait a connection to be established to make sure it will be ok, see Error handling:

I'm not sure if this helps at all. Can you replace the IFERROR array that I've used in the following formula, with your formula?