react-native-firebase/lib/modules/firestore/DocumentSnapshot.js

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/**
* @flow
* DocumentSnapshot representation wrapper
*/
import DocumentReference from './DocumentReference';
import FieldPath from './FieldPath';
import Path from './Path';
import { isObject } from '../../utils';
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import { parseNativeMap } from './utils/serialize';
import type Firestore from './';
import type { NativeDocumentSnapshot, SnapshotMetadata } from './types';
const extractFieldPathData = (data: Object | void, segments: string[]): any => {
if (!data || !isObject(data)) {
return undefined;
}
const pathValue = data[segments[0]];
if (segments.length === 1) {
return pathValue;
}
return extractFieldPathData(pathValue, segments.slice(1));
};
/**
* @class DocumentSnapshot
*/
export default class DocumentSnapshot {
_data: Object | void;
_metadata: SnapshotMetadata;
_ref: DocumentReference;
constructor(firestore: Firestore, nativeData: NativeDocumentSnapshot) {
this._data = parseNativeMap(firestore, nativeData.data);
this._metadata = nativeData.metadata;
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this._ref = new DocumentReference(
firestore,
Path.fromName(nativeData.path)
);
}
get exists(): boolean {
return this._data !== undefined;
}
get id(): string | null {
return this._ref.id;
}
get metadata(): SnapshotMetadata {
return this._metadata;
}
get ref(): DocumentReference {
return this._ref;
}
data(): Object | void {
return this._data;
}
get(fieldPath: string | FieldPath): any {
if (fieldPath instanceof FieldPath) {
return extractFieldPathData(this._data, fieldPath._segments);
}
return this._data ? this._data[fieldPath] : undefined;
}
}