Is sorting supported?

[astetsa]

I use PagingAndSortingRepository.
And I try to get pageable parameter by request like this:

@GetMapping("/find")
public Page<Data> find(@PageableDefault(size = Integer.MAX_VALUE, sort = "timestamp") final Pageable pageable) {
	return dataRepository.findAll(pageable);
}

But when I try to use Page findAll(Pageable pageable) I catch UnsupportedOperationException:
"Sorting not supported for find all scan operations".

Is there any way to sort data? Thanks!

[astetsa]

I try to use solution from issue #24
without sort in pageable parameter.
But I catch other exception "Sort not supported for scan expressions".

[derjust]

Which GSIs do you have defined?
Please also see aws-amplify/aws-sdk-ios#346 for some context

[derjust]

And while I'm working on the Spring5 support ( #98 ) - which spring-data version are you using in your project? Looks like they changed some null value into a null object. Might a transitive dependency maybe update your spring-data version?

[astetsa]

I use spring boot version '1.5.3.RELEASE'.

[derjust]

Any chance that you can try version 5.0.0?

[astetsa]

Unfortunately I can not use Spring 5 :(

[derjust]

@astetsa Any chance you can provide the output of mvn dependency:tree | grep spring-data of you setup?
To me it looks like spring-data 2.0.x is active in your scenario. If that's the case, https://github.com/derjust/spring-data-dynamodb/tree/v4.6.x should do the trick :)

[astetsa]

I use gradle

buildscript {
	ext {
		springBootVersion = '1.5.8.RELEASE'
	}
	repositories {
		mavenCentral()
		mavenLocal()
	}
	dependencies {
		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
	}
}

apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'

group = 'com.dynamodbs3'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
	mavenCentral()
	mavenLocal()
}


dependencies {
	compile 'org.springframework.boot:spring-boot-starter-web'

	compile 'com.github.derjust:spring-data-dynamodb:4.5.0'
	compile 'com.amazonaws:aws-java-sdk-dynamodb:1.11.205'

	compile 'com.amazonaws:aws-java-sdk:1.11.213'

	compile 'org.projectlombok:lombok:1.16.16'
}

[astetsa]

I have userId as hash key and creationTimestamp as sorting key.
Method works well:
Page findByUserIdOrderByCreationTimestampAsc(String userId, Pageable pageable);

But there are cases when same userId trys to add a record in same time. So I need every row in table has unique id.

I try to create the table like this: id as hash key. Then I add global secondary index: userId as hash key and creationTimestamp as range key. But when I try to use findByUserIdOrderByCreationTimestampAsc I catch an exception "Sorting not supported for scan operations".

Then I try to create the table like this: userId as hash key, id as sorting key. And I try to use local secondary index instead global: userId as hash key and creationTimestamp as range key. But I catch other exception: "Sorting only possible by [id] for the criteria specified".

Where I am mistaken?

[astetsa]

I've solved the problem. It works with the global index. It was necessary to add annotations to the model:

@DynamoDBIndexHashKey(globalSecondaryIndexName = "IndexName")
@DynamoDBIndexRangeKey(globalSecondaryIndexNames = {"IndexName"})

[derjust]

Thanks for updating the issue. Looks like it's worth to put your finding into the documentation (wiki)

Thanks again

[gauravbrills]

Ya I also observed the use of @EnableScan @EnableScanCount Page<contact> findAll(Pageable pageable); fails now which used to work in older version . Is it cause now the default sort enum is coming as UNSORTED ..

this leads to the exception for the sorting check

"Sorting not supported for find all scan operations"

I guess we should put a UNSORTED check here or something likewise .

`@Override
public Page findAll(Pageable pageable) {

	if (pageable.getSort() != null) {
		throw new UnsupportedOperationException("Sorting not supported for find all scan operations");
	}`