filters, sorting, paging...

[serayuzgur]

Field selection

• Sometimes don’t need all attributes of a resource. Give the API consumer the ability to choose returned fields. This will also reduce the network traffic and speed up the usage of the API.

GET /cars?fields=manufacturer,model,id,color

Paging (Slice)

• Add _offset and _limit (an X-Total-Count header is included in the response).

GET /cars?_offset=10&_limit=5

• To send the total entries back to the user use the custom HTTP header: X-Total-Count.

• Content-Range offset – limit / count.

  • offset: Index of the first element returned by the request.

  • limit: Index of the last element returned by the request.

  • count: Total number of elements in the collection.

• Accept-Range resource max.

• resource: The type of pagination. Must remind of the resource in use, e.g: client, order, restaurant, …

• max : Maximum number of elements that can be returned in a single request.

Sorting

• Allow ascending and descending sorting over multiple fields.
• Use sort with underscore as _sort.
• In code, descending describe as -, ascending describe as +.

GET /cars?_sort=-manufactorer,+model

Operators

• Add _filter query parameter and continue with field names,operations and values separated by ,.
• Pattern _filter=<fieldname><operation><value>.
• Supported operations.
  • = equal
  • != not equal
  • < less
  • <= less or equals
  • > greater
  • >= greater or equals
  • ~= like
  • |= in (values must be separated with |

GET http://127.0.0.1:8080/robe/users?_filter=name=seray,active=true

Full-text search

• Add _q.

GET /cars?_q=nissan

[kbukum]

I got error after some queries and application crashed.

Error Detail :
Some(Queries { fields: [], filter: [], q: None, paginate: (OFFSET(0), LIMIT(5)), slice: [], sort: [] })
paging LIMIT(5)
Some(Queries { fields: [], filter: [], q: None, paginate: (OFFSET(0), LIMIT(5)), slice: [], sort: [] })
thread 'main' panicked at 'called Result::unwrap() on an Err value: ErrorImpl { code: EofWhileParsingValue, line: 1, column: 0 }', src/libcore/result.rs:860
note: Run with RUST_BACKTRACE=1 for a backtrace.

[kbukum]

I checked the issue. It's ok about selection and paging.

Selection Test:
http://localhost:8081/posts?_fields=author 👍
http://localhost:8081/posts?_fields=author,tags 👍

Paging Tests:

OK

• http://localhost:8081/posts?_limit=1 👍
• http://localhost:8081/posts?_offset=1 👍
• http://localhost:8081/posts?_offset=1&_limit=1 👍

Selection and Paging Tests

• http://localhost:8081/posts?_fields=author&_limit=1 👍
• http://localhost:8081/posts?_fields=author,tags&_limit=1 👍
• http://localhost:8081/posts?_fields=author&_offset=1 👍
• http://localhost:8081/posts?_fields=author,tags&_offset=1 👍