Function findFromVirtual

packages/sql/src/AbstractSqlDriver.ts:335–378

(
    entityName: EntityName<T>,
    where: ObjectQuery<T>,
    options: FindOptions<T, any> | CountOptions<T, any>,
    type: QueryType,
  )

  }

  protected async findFromVirtual<T extends object>(
    entityName: EntityName<T>,
    where: ObjectQuery<T>,
    options: FindOptions<T, any> | CountOptions<T, any>,
    type: QueryType,
  ): Promise<EntityData<T>[] | number> {
    const meta = this.metadata.get<T>(entityName);

    /* v8 ignore next */
    if (!meta.expression) {
      return type === QueryType.SELECT ? [] : 0;
    }

    if (typeof meta.expression === 'string') {
      return this.wrapVirtualExpressionInSubquery(meta, meta.expression, where, options as FindOptions<T, any>, type);
    }

    const em = this.createEntityManager();
    em.setTransactionContext(options.ctx);

    const res = meta.expression(em, where, options as FindOptions<T, any, any, any>);

    if (typeof res === 'string') {
      return this.wrapVirtualExpressionInSubquery(meta, res, where, options as FindOptions<T, any>, type);
    }

    if (res instanceof QueryBuilder) {
      return this.wrapVirtualExpressionInSubquery(
        meta,
        res.getFormattedQuery(),
        where,
        options as FindOptions<T, any>,
        type,
      );
    }

    if (isRaw(res)) {
      const expr = this.platform.formatQuery(res.sql, res.params);
      return this.wrapVirtualExpressionInSubquery(meta, expr, where, options as FindOptions<T, any>, type);
    }

    /* v8 ignore next */
    return res as EntityData<T>[];
  }

  protected async *streamFromVirtual<T extends object>(
    entityName: EntityName<T>,