96 lines
3.5 KiB
TypeScript
96 lines
3.5 KiB
TypeScript
import { pick, unset } from 'lodash';
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import {
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FindOptionsUtils,
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FindTreeOptions,
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SelectQueryBuilder,
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TreeRepository,
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TreeRepositoryUtils,
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} from 'typeorm';
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import { CommentEntity } from '@/modules/content/entities/comment.entity';
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import { CustomRepository } from '@/modules/database/decorators/repository.decorator';
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type FindCommentTreeOptions = FindTreeOptions & {
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addQuery?: (query: SelectQueryBuilder<CommentEntity>) => SelectQueryBuilder<CommentEntity>;
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};
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@CustomRepository(CommentEntity)
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export class CommentRepository extends TreeRepository<CommentEntity> {
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buildBaseQB(qb: SelectQueryBuilder<CommentEntity>): SelectQueryBuilder<CommentEntity> {
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return qb
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.leftJoinAndSelect(`comment.parent`, 'parent')
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.leftJoinAndSelect(`comment.post`, `post`)
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.orderBy('comment.createdAt', 'DESC');
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}
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async findTrees(options: FindCommentTreeOptions): Promise<CommentEntity[]> {
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options.relations = ['parent', 'children'];
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const roots = await this.findRoots(options);
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await Promise.all(roots.map((root) => this.findDescendantsTree(root, options)));
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return roots;
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}
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findRoots(options?: FindCommentTreeOptions): Promise<CommentEntity[]> {
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const { addQuery, ...rest } = options;
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const escape = (val: string) => this.manager.connection.driver.escape(val);
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const joinColumn = this.metadata.treeParentRelation!.joinColumns[0];
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const parentPropertyName = joinColumn.givenDatabaseName || joinColumn.databaseName;
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let qb = this.buildBaseQB(this.createQueryBuilder('comment'));
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FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, rest);
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qb.where(`${escape('comment')}.${escape(parentPropertyName)} IS NULL`);
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qb = addQuery ? addQuery(qb) : qb;
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return qb.getMany();
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}
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createDtsQueryBuilder(
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closureTable: string,
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entity: CommentEntity,
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options: FindCommentTreeOptions = {},
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): SelectQueryBuilder<CommentEntity> {
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const { addQuery } = options;
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const qb = this.buildBaseQB(
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super.createDescendantsQueryBuilder('comment', closureTable, entity),
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);
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return addQuery ? addQuery(qb) : qb;
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}
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async findDescendantsTree(
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entity: CommentEntity,
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options: FindCommentTreeOptions = {},
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): Promise<CommentEntity> {
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const qb: SelectQueryBuilder<CommentEntity> = this.createDtsQueryBuilder(
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'treeClosure',
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entity,
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options,
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);
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FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, pick(options, ['relations', 'depth']));
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const entities = await qb.getRawAndEntities();
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const relationMaps = TreeRepositoryUtils.createRelationMaps(
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this.manager,
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this.metadata,
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'comment',
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entities.raw,
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);
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TreeRepositoryUtils.buildChildrenEntityTree(
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this.metadata,
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entity,
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entities.entities,
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relationMaps,
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{ depth: -1, ...pick(options, ['relations']) },
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);
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return entity;
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}
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async toFlatTrees(trees: CommentEntity[], depth = 0): Promise<CommentEntity[]> {
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const data: Omit<CommentEntity, 'children'>[] = [];
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for (const item of trees) {
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item.depth = depth;
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const { children } = item;
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unset(item, 'children');
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data.push(item);
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data.push(...(await this.toFlatTrees(children, depth + 1)));
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}
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return data as CommentEntity[];
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}
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}
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