text: import { __awaiter, __generator } from "tslib";
  var RelationCountLoader = /** @class */ (function () {
      // -------------------------------------------------------------------------
      // Constructor
      // -------------------------------------------------------------------------
      function RelationCountLoader(connection, queryRunner, relationCountAttributes) {
          this.connection = connection;
          this.queryRunner = queryRunner;
          this.relationCountAttributes = relationCountAttributes;
      }
      // -------------------------------------------------------------------------
      // Public Methods
      // -------------------------------------------------------------------------
      RelationCountLoader.prototype.load = function (rawEntities) {
          return __awaiter(this, void 0, void 0, function () {
              var onlyUnique, promises;
              var _this = this;
              return __generator(this, function (_a) {
                  onlyUnique = function (value, index, self) {
                      return self.indexOf(value) === index;
                  };
                  promises = this.relationCountAttributes.map(function (relationCountAttr) { return __awaiter(_this, void 0, void 0, function () {
                      var relation, inverseRelation, referenceColumnName_1, inverseSideTable, inverseSideTableName, inverseSideTableAlias, inverseSidePropertyName, referenceColumnValues, qb, joinTableColumnName_1, inverseJoinColumnName, firstJunctionColumn, secondJunctionColumn, referenceColumnValues, junctionAlias, inverseSideTableName, inverseSideTableAlias, junctionTableName, condition, qb;
                      var _a, _b;
                      return __generator(this, function (_c) {
                          switch (_c.label) {
                              case 0:
                                  if (!relationCountAttr.relation.isOneToMany) return [3 /*break*/, 2];
                                  relation = relationCountAttr.relation;
                                  inverseRelation = relation.inverseRelation;
                                  referenceColumnName_1 = inverseRelation.joinColumns[0].referencedColumn.propertyName;
                                  inverseSideTable = relation.inverseEntityMetadata.target;
                                  inverseSideTableName = relation.inverseEntityMetadata.tableName;
                                  inverseSideTableAlias = relationCountAttr.alias || inverseSideTableName;
                                  inverseSidePropertyName = inverseRelation.propertyName;
                                  referenceColumnValues = rawEntities
                                      .map(function (rawEntity) { return rawEntity[relationCountAttr.parentAlias + "_" + referenceColumnName_1]; })
                                      .filter(function (value) { return !!value; });
                                  referenceColumnValues = referenceColumnValues.filter(onlyUnique);
                                  // ensure we won't perform redundant queries for joined data which was not found in selection
                                  // example: if post.category was not found in db then no need to execute query for category.imageIds
                                  if (referenceColumnValues.length === 0)
                                      return [2 /*return*/, { relationCountAttribute: relationCountAttr, results: [] }];
                                  qb = this.connection.createQueryBuilder(this.queryRunner);
                                  qb.select(inverseSideTableAlias + "." + inverseSidePropertyName, "parentId")
                                      .addSelect("COUNT(*)", "cnt")
                                      .from(inverseSideTable, inverseSideTableAlias)
                                      .where(inverseSideTableAlias + "." + inverseSidePropertyName + " IN (:...ids)")
                                      .addGroupBy(inverseSideTableAlias + "." + inverseSidePropertyName)
                                      .setParameter("ids", referenceColumnValues);
                                  // apply condition (custom query builder factory)
                                  if (relationCountAttr.queryBuilderFactory)
                                      relationCountAttr.queryBuilderFactory(qb);
                                  _a = {
                                      relationCountAttribute: relationCountAttr
                                  };
                                  return [4 /*yield*/, qb.getRawMany()];
                              case 1: return [2 /*return*/, (_a.results = _c.sent(),
                                      _a)];
                              case 2:
                                  inverseJoinColumnName = void 0;
                                  firstJunctionColumn = void 0;
                                  secondJunctionColumn = void 0;
                                  if (relationCountAttr.relation.isOwning) { // todo fix joinColumns[0] and inverseJoinColumns[0].
                                      joinTableColumnName_1 = relationCountAttr.relation.joinColumns[0].referencedColumn.databaseName;
                                      inverseJoinColumnName = relationCountAttr.relation.inverseJoinColumns[0].referencedColumn.databaseName;
                                      firstJunctionColumn = relationCountAttr.relation.junctionEntityMetadata.columns[0];
                                      secondJunctionColumn = relationCountAttr.relation.junctionEntityMetadata.columns[1];
                                  }
                                  else {
                                      joinTableColumnName_1 = relationCountAttr.relation.inverseRelation.inverseJoinColumns[0].referencedColumn.databaseName;
                                      inverseJoinColumnName = relationCountAttr.relation.inverseRelation.joinColumns[0].referencedColumn.databaseName;
                                      firstJunctionColumn = relationCountAttr.relation.junctionEntityMetadata.columns[1];
                                      secondJunctionColumn = relationCountAttr.relation.junctionEntityMetadata.columns[0];
                                  }
                                  referenceColumnValues = rawEntities
                                      .map(function (rawEntity) { return rawEntity[relationCountAttr.parentAlias + "_" + joinTableColumnName_1]; })
                                      .filter(function (value) { return !!value; });
                                  referenceColumnValues = referenceColumnValues.filter(onlyUnique);
                                  // ensure we won't perform redundant queries for joined data which was not found in selection
                                  // example: if post.category was not found in db then no need to execute query for category.imageIds
                                  if (referenceColumnValues.length === 0)
                                      return [2 /*return*/, { relationCountAttribute: relationCountAttr, results: [] }];
                                  junctionAlias = relationCountAttr.junctionAlias;
                                  inverseSideTableName = relationCountAttr.joinInverseSideMetadata.tableName;
                                  inverseSideTableAlias = relationCountAttr.alias || inverseSideTableName;
                                  junctionTableName = relationCountAttr.relation.junctionEntityMetadata.tableName;
                                  condition = junctionAlias + "." + firstJunctionColumn.propertyName + " IN (" + referenceColumnValues.map(function (vals) { return isNaN(vals) ? "'" + vals + "'" : vals; }) + ")" +
                                      " AND " + junctionAlias + "." + secondJunctionColumn.propertyName + " = " + inverseSideTableAlias + "." + inverseJoinColumnName;
                                  qb = this.connection.createQueryBuilder(this.queryRunner);
                                  qb.select(junctionAlias + "." + firstJunctionColumn.propertyName, "parentId")
                                      .addSelect("COUNT(" + qb.escape(inverseSideTableAlias) + "." + qb.escape(inverseJoinColumnName) + ")", "cnt")
                                      .from(inverseSideTableName, inverseSideTableAlias)
                                      .innerJoin(junctionTableName, junctionAlias, condition)
                                      .addGroupBy(junctionAlias + "." + firstJunctionColumn.propertyName);
                                  // apply condition (custom query builder factory)
                                  if (relationCountAttr.queryBuilderFactory)
                                      relationCountAttr.queryBuilderFactory(qb);
                                  _b = {
                                      relationCountAttribute: relationCountAttr
                                  };
                                  return [4 /*yield*/, qb.getRawMany()];
                              case 3: return [2 /*return*/, (_b.results = _c.sent(),
                                      _b)];
                          }
                      });
                  }); });
                  return [2 /*return*/, Promise.all(promises)];
              });
          });
      };
      return RelationCountLoader;
  }());
  export { RelationCountLoader };
  
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