@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
57 lines • 2.16 kB
JavaScript
;
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.CountField = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const AggregationField_1 = require("./AggregationField");
class CountField extends AggregationField_1.AggregationField {
constructor({ alias, entity, fields, }) {
super(alias);
this.entity = entity;
this.countFields = fields;
}
getChildren() {
return [];
}
getProjectionField(variable) {
return { [this.alias]: variable };
}
getAggregationExpr(variable) {
return cypher_builder_1.default.count(variable).distinct();
}
getAggregationProjection(target, returnVar) {
const resultMap = new cypher_builder_1.default.Map();
if (this.countFields.nodes) {
resultMap.set("nodes", this.getAggregationExpr(target));
}
if (this.countFields.edges) {
if (!this.edgeVar) {
throw new Error("Edge variable not defined in Count field. This is likely a bug with the GraphQL library.");
}
resultMap.set("edges", this.getAggregationExpr(this.edgeVar));
}
return new cypher_builder_1.default.Return([resultMap, returnVar]);
}
}
exports.CountField = CountField;
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