CODEWITHSUNDEEP
javamongodbsortingspring-data-mongodb
ljs
ljs

Reputation: 533

Query mongoDB sorting by array value and using pagination in Springdata MongoDB

I am trying to query a mongoDB collection sorting by an array value(in addition to other fields) and the results need to be paginated also. The sorting is not working for the array value, but it works for other fields. Here is the code:

sortBy = "programInstance.title.descriptions[0].value";
PageRequest pageRequest = = PageRequest.of(filter.getPageNumber(), filter.getPageSize(),
                    new Sort("DESC".equalsIgnoreCase(filter.getSortOrder()) ? Sort.Direction.DESC : Sort.Direction.ASC, sortBy));
Page<Offer> st = new PageImpl<>(mongoTemplate.find(query.with(pageRequest),Offer.class), pageRequest, pageCount);

Any help is very much appreciated..

Upvotes: 2

Views: 647

Answers (2)

ljs
ljs

Reputation: 533

It worked successfully with this expression sortBy = "programInstance.title.descriptions.0.value";

Upvotes: 1

its4zahoor
its4zahoor

Reputation: 1821

//One or two records from your collection
const data = [{
  name: 'abc',
  place: 'US',
  zone: 'Pacific'
}, {
  name: 'xyz',
  place: 'PK',
  zone: 'Asia'
}, ]
const fields = Object.keys(data[0]);
console.log("Fields in collection: ",fields);
const sortBy = fields[0];
console.log("Sort By: ", sortBy);
//const sort = new Sort("DESC".equalsIgnoreCase(filter.getSortOrder()) ? //Sort.Direction.DESC : Sort.Direction.ASC, sortBy);
//PageRequest pageRequest = = PageRequest.of(filter.getPageNumber(), //filter.getPageSize(), sort);
//Page < Offer > st = new PageImpl < > //(mongoTemplate.find(query.with(pageRequest), Offer.class), pageRequest, //pageCount);

The sort parameter is a value (string type), on which the sort is performed, you can't pass a string which needs further evaluation (in your case) to get the value. Instead directly save your value into your sortBy variable and then pass sortBy to your query.

Upvotes: 0

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