collectype

collectype v0.13.0

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collectype / factory/queries/queryState / queryStateFactory

Function: queryStateFactory()

queryStateFactory<T, C>(ctx, oper): <K>(field) => C

Defined in: factory/queries/queryState.ts:39

Creates a predicate filter for query state checks using PredicType.query.state.

Type Parameters

T

T

The item type in the collection.

C

C extends Wherable<T, C>

The Wherable context type (must extend Wherable<T, C>).

Parameters

ctx

C

The context (usually a collection) supporting the where method.

oper

QueryStateOper

The query state operation to perform.

Returns

Returns a function that takes a query field on T, checks its state, and filters the context.

<K>(field) => C

Example

// Example: query state filter with URL
import { BaseFunctions, queryStateFactory } from 'collectype';

type Post = { id: number; query: URL };

class PostFunctions extends BaseFunctions<Post> {
  queryIsEmpty = queryStateFactory<Post, this>(this, 'is_empty');
}

const posts: Post[] = [
  { id: 1, query: new URL('https://example.com/?tag=ts') },
  { id: 2, query: new URL('https://example.com/') }
];

const fn = new PostFunctions(posts);
const filtered = fn.queryIsEmpty('query');
// filtered contains items whose query is empty

Remarks

• Supports fields of type URL and URLSearchParams.
• The operation must match the signature of PredicType.query.state.
• Returns a new filtered context; does not mutate the original.

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