Method validateModification

packages/core/src/entity/Collection.ts:538–568

(items: T[])

  }

  private validateModification(items: T[]): void {
    if (this.#readonly) {
      throw ValidationError.cannotModifyReadonlyCollection(this.owner, this.property);
    }

    const check = (item: AnyEntity) => {
      if (!item) {
        return false;
      }

      if (!Utils.isEntity(item)) {
        throw ValidationError.notEntity(this.owner, this.property, item);
      }

      // currently we allow persisting to inverse sides only in SQL drivers
      if (this.property.pivotTable || !this.property.mappedBy) {
        return false;
      }

      if (helper(item).__initialized) {
        return false;
      }

      return !item[this.property.mappedBy] && this.property.kind === ReferenceKind.MANY_TO_MANY;
    };

    // throw if we are modifying inverse side of M:N collection when owning side is initialized (would be ignored when persisting)
    if (items.some(item => check(item))) {
      throw ValidationError.cannotModifyInverseCollection(this.owner, this.property);
    }
  }

  /** Converts all items in the collection to plain DTO objects. */
  toArray<TT extends T>(): EntityDTO<TT>[] {