Relay Store
The Relay Store can be used to programmatically update client-side data inside updater functions. The following is a reference of the Relay Store interface.
Table of Contents:
RecordSourceSelectorProxy
The RecordSourceSelectorProxy is the type of the store that updater functions receive as an argument. The following is the RecordSourceSelectorProxy interface:
interface RecordSourceSelectorProxy {
create(dataID: string, typeName: string): RecordProxy;
delete(dataID: string): void;
get(dataID: string): ?RecordProxy;
getRoot(): RecordProxy;
getRootField(fieldName: string): ?RecordProxy;
getPluralRootField(fieldName: string): ?Array<?RecordProxy>;
}
create(dataID: string, typeName: string): RecordProxy
Creates a new record in the store given a dataID and the typeName as defined by the GraphQL schema. Returns a RecordProxy which serves as an interface to mutate the newly created record.
Example
const record = store.create(dataID, 'Todo');
delete(dataID: string): void
Deletes a record from the store given its dataID.
Example
store.delete(dataID);
get(dataID: string): ?RecordProxy
Retrieves a record from the store given its dataID. Returns a RecordProxy which serves as an interface to mutate the record.
Example
const record = store.get(dataID);
getRoot(): RecordProxy
Returns the RecordProxy representing the root of the GraphQL document.
Example
Given the GraphQL document:
viewer {
id
}
Usage:
// Represents root query
const root = store.getRoot();
getRootField(fieldName: string): ?RecordProxy
Retrieves a root field from the store given the fieldName, as defined by the GraphQL document. Returns a RecordProxy which serves as an interface to mutate the record.
Example
Given the GraphQL document:
viewer {
id
}
Usage:
const viewer = store.getRootField('viewer');
getPluralRootField(fieldName: string): ?Array<?RecordProxy>
Retrieves a root field that represents a collection from the store given the fieldName, as defined by the GraphQL document. Returns an array of RecordProxies.
Example
Given the GraphQL document:
nodes(first: 10) {
# ...
}
Usage:
const nodes = store.getPluralRootField('nodes');
RecordProxy
The RecordProxy serves as an interface to mutate records:
interface RecordProxy {
copyFieldsFrom(sourceRecord: RecordProxy): void;
getDataID(): string;
getLinkedRecord(name: string, arguments?: ?Object): ?RecordProxy;
getLinkedRecords(name: string, arguments?: ?Object): ?Array<?RecordProxy>;
getOrCreateLinkedRecord(
name: string,
typeName: string,
arguments?: ?Object,
): RecordProxy;
getType(): string;
getValue(name: string, arguments?: ?Object): mixed;
setLinkedRecord(
record: RecordProxy,
name: string,
arguments?: ?Object,
): RecordProxy;
setLinkedRecords(
records: Array<?RecordProxy>,
name: string,
arguments?: ?Object,
): RecordProxy;
setValue(value: mixed, name: string, arguments?: ?Object): RecordProxy;
}
getDataID(): string
Returns the dataID of the current record.
Example
const id = record.getDataID();
getType(): string
Gets the type of the current record, as defined by the GraphQL schema.
Example
const type = user.getType(); // User
getValue(name: string, arguments?: ?Object): mixed
Gets the value of a field in the current record given the field name.
Example
Given the GraphQL document:
viewer {
id
name
}
Usage:
const name = viewer.getValue('name');
Optionally, if the field takes arguments, you can pass a bag of variables.
Example
Given the GraphQL document:
viewer {
id
name(arg: $arg)
}
Usage:
const name = viewer.getValue('name', {arg: 'value'});
getLinkedRecord(name: string, arguments?: ?Object): ?RecordProxy
Retrieves a record associated with the current record given the field name, as defined by the GraphQL document. Returns a RecordProxy.
Example
Given the GraphQL document:
rootField {
viewer {
id
name
}
}
Usage:
const rootField = store.getRootField('rootField');
const viewer = rootField.getLinkedRecord('viewer');
Optionally, if the linked record takes arguments, you can pass a bag of variables as well.
Example
Given the GraphQL document:
rootField {
viewer(arg: $arg) {
id
}
}
Usage:
const rootField = store.getRootField('rootField');
const viewer = rootField.getLinkedRecord('viewer', {arg: 'value'});
getLinkedRecords(name: string, arguments?: ?Object): ?Array<?RecordProxy>
Retrieves the set of records associated with the current record given the field name, as defined by the GraphQL document. Returns an array of RecordProxies.
Example
Given the GraphQL document:
rootField {
nodes {
# ...
}
}
Usage:
const rootField = store.getRootField('rootField');
const nodes = rootField.getLinkedRecords('nodes');
Optionally, if the linked record takes arguments, you can pass a bag of variables as well.
Example
Given the GraphQL document:
rootField {
nodes(first: $count) {
# ...
}
}
Usage:
const rootField = store.getRootField('rootField');
const viewer = rootField.getLinkedRecord('viewer', {count: 10});
getOrCreateLinkedRecord(name: string, typeName: string, arguments?: ?Object)
Retrieves the a record associated with the current record given the field name, as defined by the GraphQL document. If the linked record does not exist, it will be created given the type name. Returns a RecordProxy.
Example
Given the GraphQL document:
rootField {
viewer {
id
}
}
Usage:
const rootField = store.getRootField('rootField');
const newViewer = rootField.getOrCreateLinkedRecord('viewer', 'User'); // Will create if it doesn't exist
Optionally, if the linked record takes arguments, you can pass a bag of variables as well.
setValue(value: mixed, name: string, arguments?: ?Object): RecordProxy
Mutates the current record by setting a new value on the specified field. Returns the mutated record.
Given the GraphQL document:
viewer {
id
name
}
Usage:
viewer.setValue('New Name', 'name');
Optionally, if the field takes arguments, you can pass a bag of variables.
viewer.setValue('New Name', 'name', {arg: 'value'});
copyFieldsFrom(sourceRecord: RecordProxy): void
Mutates the current record by copying the fields over from the passed in record sourceRecord.
Example
const record = store.get(id1);
const otherRecord = store.get(id2);
record.copyFieldsFrom(otherRecord); // Mutates `record`
setLinkedRecord(record: RecordProxy, name: string, arguments?: ?Object)
Mutates the current record by setting a new linked record on the given the field name.
Example
Given the GraphQL document:
rootField {
viewer {
id
}
}
Usage:
const rootField = store.getRootField('rootField');
const newViewer = store.create(/* ... */)''
rootField.setLinkedRecord(newViewer, 'viewer'); //
Optionally, if the linked record takes arguments, you can pass a bag of variables as well.
setLinkedRecords(records: Array<RecordProxy>, name: string, variables?: ?Object)
Mutates the current record by setting a new set of linked records on the given the field name.
Example
Given the GraphQL document:
rootField {
nodes {
# ...
}
}
Usage:
const rootField = store.getRootField('rootField');
const newNode = store.create(/* ... */);
const newNodes = [...rootField.getLinkedRecords('nodes'), newNode];
rootField.setLinkedRecords(newNodes, 'nodes'); //
Optionally, if the linked record takes arguments, you can pass a bag of variables as well.
ConnectionHandler
ConnectionHandler is a utility module exposed by relay-runtime that aids in the manipulation of connections. ConnectionHandler exposes the following interface:
interface ConnectionHandler {
getConnection(
record: RecordProxy,
key: string,
filters?: ?Object,
): ?RecordProxy,
createEdge(
store: RecordSourceProxy,
connection: RecordProxy,
node: RecordProxy,
edgeType: string,
): RecordProxy,
insertEdgeBefore(
connection: RecordProxy,
newEdge: RecordProxy,
cursor?: ?string,
): void,
insertEdgeAfter(
connection: RecordProxy,
newEdge: RecordProxy,
cursor?: ?string,
): void,
deleteNode(connection: RecordProxy, nodeID: string): void
}
getConnection(record: RecordProxy, key: string, filters?: ?Object)
Given a record and a connection key, and optionally a set of filters, getConnection retrieves a RecordProxy that represents a connection that was annotated with a @connection directive.
First, let's take a look at a plain connection:
fragment FriendsFragment on User {
friends(first: 10) {
edges {
node {
id
}
}
}
}
Accessing a plain connection field like this is the same as other regular field:
// The `friends` connection record can be accessed with:
const user = store.get(userID);
const friends = user && user.getLinkedRecord(user, 'friends');
// Access fields on the connection:
const edges = friends.getLinkedRecords('edges');
In a pagination container, we usually annotate the actual connection field with @connection to tell Relay which part needs to be paginated:
fragment FriendsFragment on User {
friends(first: 10, orderby: "firstname") @connection(
key: "FriendsFragment_friends",
) {
edges {
node {
id
}
}
}
}
For connections like the above, ConnectionHandler helps us find the record:
import {ConnectionHandler} from 'relay-runtime';
// The `friends` connection record can be accessed with:
const user = store.get(userID);
const friends = ConnectionHandler.getConnection(
user, // parent record
'FriendsFragment_friends' // connection key
{orderby: 'firstname'} // 'filters' that is used to identify the connection
);
// Access fields on the connection:
const edges = friends.getLinkedRecords('edges');
Edge creation and insertion
createEdge(store: RecordSourceProxy, connection: RecordProxy, node: RecordProxy, edgeType: string)
Creates an edge given a store, a connection, the edge type, and a record that holds that connection.
insertEdgeBefore(connection: RecordProxy, newEdge: RecordProxy, cursor?: ?string)
Given a connection, inserts the edge at the beginning of the connection, or before the specified cursor.
insertEdgeAfter(connection: RecordProxy, newEdge: RecordProxy, cursor?: ?string)
Given a connection, inserts the edge at the end of the connection, or after the specified cursor.
Example
const user = store.get(userID);
const friends = ConnectionHandler.getConnection(user, 'friends');
const edge = ConnectionHandler.createEdge(store, friends, user, 'UserEdge');
// No cursor provided, append the edge at the end.
ConnectionHandler.insertEdgeAfter(friends, edge);
// No cursor provided, Insert the edge at the front:
ConnectionHandler.insertEdgeBefore(friends, edge);
deleteNode(connection: RecordProxy, nodeID: string): void
Given a connection, deletes any edges whose id matches the given id.
Example
const user = store.get(userID);
const friends = ConnectionHandler.getConnection(user, 'friends');
ConnectionHandler.deleteNode(friends, idToDelete);