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API/DrfRequestStrategy

DrfRequestStrategy

src/strategies/drf-request.strategy.ts6 public methodsclass

Request strategy for the Django REST Framework (DRF) driver

Generates URIs in DRF’s flat query-parameter format, augmented by django-filter’s double-underscore lookup convention:

  • Simple filters: field=value (multi-value collapses to field__in=v1,v2)
  • Operator filters: field__lookup=value (translated from FilterOperatorEnum — GTE→__gte, ILIKE→__icontains, BTW→__range, NULL→__isnull, etc.)
  • Ordering: ordering=-field1,field2 (- prefix = DESC)
  • Search: search=term (DRF’s SearchFilter)
  • Pagination: page=N&page_size=M (PageNumberPagination)

ordering and page_size are DRF-idiomatic param names and are intentionally not configurable via QueryBuilderOptions — same precedent as PostgREST’s order and offset. PostgREST’s full-text search operators (FTS, PHFTS, PLFTS, WFTS) and the generic NOT have no django-filter equivalent and throw UnsupportedFilterOperatorError.

Constructor

Section titled “Constructor”
new DrfRequestStrategy()

Properties

Section titled “Properties”
Property Type Description
capabilities StrategyCapabilities Simple filters, operator filters (django-filter lookups), sorts, and global search — no per-model fields, no relation includes, no flat select (django-restql adds it but is not core DRF)

Methods

Section titled “Methods”

assertResource()

Section titled “assertResource()”
assertResource(state: QueryBuilderState): void

Throw if the resource is not set on the state

Centralises the message that was previously copy-pasted across four of the five concrete strategies.

Parameter Type Description
state QueryBuilderState The current query builder state

baseUri()

Section titled “baseUri()”
baseUri(state: QueryBuilderState): string

Compute the base path (no query string)

Parameter Type Description
state QueryBuilderState The current query builder state

Returns — The base URI without the query separator (e.g. /users or https://api.example.com/users)

buildUri()

Section titled “buildUri()”
buildUri(state: QueryBuilderState, options: QueryBuilderOptions): string

Compose the full request URI from the given state

Template method: validates the resource, computes the base path, delegates the per-driver query-string segments to parts(...), and joins them with the conventional ?/& separators.

Parameter Type Description
state QueryBuilderState The current query builder state
options QueryBuilderOptions The query parameter key name configuration

Returns — The composed URI string

join()

Section titled “join()”
join(base: string, segments: string[]): string

Glue the base URI and the per-driver query-string segments

Returns the bare base when no segments were emitted (e.g. PostgREST in RANGE mode with no filters), otherwise joins with ? + &.

Parameter Type Description
base string The base URI from _baseUri
segments string[] The query-string fragments from parts(...)

Returns — The full URI

parts()

Section titled “parts()”
parts(state: QueryBuilderState, options: QueryBuilderOptions): string[]

Emit DRF-format query-string segments in canonical order: filters → operator filters → ordering → search → pagination

Parameter Type Description
state QueryBuilderState The current query builder state
options QueryBuilderOptions The query parameter key name configuration

Returns — Ordered query-string fragments

validateLimit()

Section titled “validateLimit()”
validateLimit(limit: number): void

Validate that a limit value is acceptable for this driver

Default policy: positive integer. Drivers that recognise a sentinel (NestJS treats -1 as “fetch all”) override this method.

Parameter Type Description
limit number The limit value to validate