Method addTPTParentFields

packages/sql/src/query/QueryBuilder.ts:3620–3648

* For TPT inheritance: adds field selections from parent tables.

()

   * For TPT inheritance: adds field selections from parent tables.
   */
  private addTPTParentFields(): void {
    const meta = this.mainAlias.meta;

    if (
      meta?.inheritanceType !== 'tpt' ||
      !meta.tptParent ||
      ![QueryType.SELECT, QueryType.COUNT].includes(this.type)
    ) {
      return;
    }

    if (!this.#state.fields?.includes('*') && !this.#state.fields?.includes(`${this.mainAlias.aliasName}.*`)) {
      return;
    }

    let parentMeta: EntityMetadata<Entity> | undefined = meta.tptParent;
    while (parentMeta) {
      const parentAlias = this.#state.tptAlias[parentMeta.className];
      if (parentAlias) {
        const schema = parentMeta.schema === '*' ? '*' : this.driver.getSchemaName(parentMeta);
        parentMeta
          .ownProps!.filter(prop => this.platform.shouldHaveColumn(prop, []))
          .forEach(prop =>
            this.#state.fields!.push(...this.driver.mapPropToFieldNames(this, prop, parentAlias, parentMeta!, schema)),
          );
      }
      parentMeta = parentMeta.tptParent;
    }
  }

  /**
   * For TPT polymorphic queries: LEFT JOINs all child tables when querying a TPT base class.