TreeRepository finds don't allow options

Issue type:

[ ] question [ ] bug report [ * ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [ ] mysql / mariadb [ ] oracle [ ] postgres [ ] sqlite [ ] sqljs [ ] react-native

TypeORM version:

[ ] latest [ ] @next [*] 0.2.6

TreeRepository has useful methods such as findTrees, findRoots, etc. but these methods do not take find options like find does, limiting their use as you can’t filter or limit (sub)trees.

As an example I would like to find all tree roots which match some predicate (attached to a certain category) as well as only selecting the first N roots, and all of their descendants.

It also doesn’t seem to load relations, and there is no way to pass a relations parameter.

[pdashford]

You can create your own method, here’s how I did mine

import { TreeRepository } from 'typeorm'

declare module 'typeorm/repository/TreeRepository' {
  interface TreeRepository<Entity> {
    findTreesBy(this: TreeRepository<Entity>, where, value): Promise<Entity[]>
  }
}

TreeRepository.prototype.findTreesBy = async function <Entity>(
  this: TreeRepository<Entity>,
  where,
  value
): Promise<Entity[]> {
  const escapeAlias = (alias: string) => this.manager.connection.driver.escape(alias)
  const escapeColumn = (column: string) => this.manager.connection.driver.escape(column)
  const parentPropertyName = this.manager.connection.namingStrategy.joinColumnName(
    this.metadata.treeParentRelation!.propertyName,
    this.metadata.primaryColumns[0].propertyName
  )

  const roots = await this.createQueryBuilder('treeEntity')
    .where(`${escapeAlias('treeEntity')}.${escapeColumn(parentPropertyName)} IS NULL`)
    .andWhere(`${escapeAlias('treeEntity')}.${escapeColumn(where)} = :value`, { value })
    .getMany()
  return Promise.all(roots.map((root) => this.findDescendantsTree(root)))
}

Then

  const trees = await manager.getTreeRepository(GherkinFeature).findTreesBy('name', 'a1')

Hope that helps

[jeffersonveloso]

  const trees = await manager.getTreeRepository(GherkinFeature).findTreesBy('name', 'a1')

Open a PR with this feature bro, is very relevant feature.