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graphql-compose-connection
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This is a plugin for graphql-compose family, which adds to the ObjectTypeComposer connection
resolver.
Live demo: https://graphql-compose.herokuapp.com/
This package completely follows to Relay Cursor Connections Specification (https://relay.dev/graphql/connections.htm).
Besides standard connection arguments first
, last
, before
and after
, also added significant arguments:
filter
arg - for filtering recordssort
arg - for sorting records. Build in mechanism allows sort by any unique indexes (not only by id). Also supported compound sorting (by several fields).npm install graphql graphql-compose graphql-compose-connection --save
Modules graphql
and graphql-compose
are in peerDependencies
, so should be installed explicitly in your app. They should not installed as submodules, cause internally checks the classes instances.
Implementation details of findManyResolver
and countResolver
can be found in this file.
import { prepareConnectionResolver } from 'graphql-compose-connection';
import { UserTC, findManyResolver, countResolver } from './user';
prepareConnectionResolver(userTC, {
findManyResolver,
countResolver,
sort: {
// Sorting key, visible for users in GraphQL Schema
_ID_ASC: {
// Sorting value for ORM/Driver
value: { _id: 1 },
// Field names in record, which data will be packed in `cursor`
// edges {
// cursor <- base64(cursorData), for this example `cursorData` = { _id: 334ae453 }
// node <- record from DB
// }
// By this fields MUST be created UNIQUE index in database!
cursorFields: ['_id'],
// If for connection query provided `before` argument with above `cursor`.
// We should construct (`rawQuery`) which will be point to dataset before cursor.
// Unpacked data from `cursor` will be available in (`cursorData`) argument.
// PS. All other filter options provided via GraphQL query will be added automatically.
// ----- [record] ----- sorted dataset, according to above option with `value` name
// ^^^^^ `rawQuery` should filter this set
beforeCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery._id) rawQuery._id = {};
rawQuery._id.$lt = cursorData._id;
},
// Constructing `rawQuery` for connection `after` argument.
// ----- [record] ----- sorted dataset
// ^^^^^ `rawQuery` should filter this set
afterCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery._id) rawQuery._id = {};
rawQuery._id.$gt = cursorData._id;
},
},
_ID_DESC: {
value: { _id: -1 },
cursorFields: ['_id'],
beforeCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery._id) rawQuery._id = {};
rawQuery._id.$gt = cursorData._id;
},
afterCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery._id) rawQuery._id = {};
rawQuery._id.$lt = cursorData._id;
},
},
// More complex sorting parameter with 2 fields
AGE_ID_ASC: {
value: { age: 1, _id: -1 },
// By these fields MUST be created COMPOUND UNIQUE index in database!
cursorFields: ['age', '_id'],
beforeCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery.age) rawQuery.age = {};
if (!rawQuery._id) rawQuery._id = {};
rawQuery.age.$lt = cursorData.age;
rawQuery._id.$gt = cursorData._id;
},
afterCursorQuery: (rawQuery, cursorData, resolveParams) => {
if (!rawQuery.age) rawQuery.age = {};
if (!rawQuery._id) rawQuery._id = {};
rawQuery.age.$gt = cursorData.age;
rawQuery._id.$lt = cursorData._id;
},
}
},
});
graphql-compose-mongoose - converts mongoose models to graphql types
FAQs
Plugin for `graphql-compose` which provide a connection resolver for types.
The npm package graphql-compose-connection receives a total of 6,332 weekly downloads. As such, graphql-compose-connection popularity was classified as popular.
We found that graphql-compose-connection demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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