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49 lines
1.8 KiB
49 lines
1.8 KiB
import {AlternateActions, AlternateStorage} from 'app/common/AlternateActions';
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import {DocData} from 'app/common/DocData';
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import {TableData} from 'app/common/TableData';
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import {IndexColumns} from 'app/server/lib/DocStorage';
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export type {ProcessedAction} from 'app/common/AlternateActions';
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export type OnDemandStorage = AlternateStorage;
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/**
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* Handle converting UserActions to DocActions for onDemand tables.
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*/
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export class OnDemandActions extends AlternateActions {
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private _tablesMeta: TableData = this._docData.getMetaTable('_grist_Tables');
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private _columnsMeta: TableData = this._docData.getMetaTable('_grist_Tables_column');
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constructor(_storage: OnDemandStorage, private _docData: DocData,
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private _forceOnDemand: boolean = false) {
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super(_storage);
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}
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// TODO: Ideally a faster data structure like an index by tableId would be used to decide whether
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// the table is onDemand.
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public isOnDemand(tableId: string): boolean {
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if (this._forceOnDemand) { return true; }
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const tableRef = this._tablesMeta.findRow('tableId', tableId);
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// OnDemand tables must have a record in the _grist_Tables metadata table.
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return tableRef ? Boolean(this._tablesMeta.getValue(tableRef, 'onDemand')) : false;
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}
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public usesAlternateStorage(tableId: string): boolean {
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return this.isOnDemand(tableId);
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}
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/**
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* Compute the indexes we would like to have, given the current schema.
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*/
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public getDesiredIndexes(): IndexColumns[] {
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const desiredIndexes: IndexColumns[] = [];
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for (const c of this._columnsMeta.getRecords()) {
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const t = this._tablesMeta.getRecord(c.parentId as number);
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if (t && t.onDemand && c.type && (c.type as string).startsWith('Ref:')) {
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desiredIndexes.push({tableId: t.tableId as string, colId: c.colId as string});
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}
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}
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return desiredIndexes;
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}
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}
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