@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
56 lines • 2.68 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.RelationshipSelectionPattern = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const context_has_target_1 = require("../../../utils/context-has-target");
const create_node_from_entity_1 = require("../../../utils/create-node-from-entity");
const SelectionPattern_1 = require("./SelectionPattern");
class RelationshipSelectionPattern extends SelectionPattern_1.SelectionPattern {
constructor({ relationship, alias, targetOverride, }) {
super();
this.relationship = relationship;
this.alias = alias;
this.targetOverride = targetOverride;
}
apply(context) {
if (!(0, context_has_target_1.hasTarget)(context))
throw new Error("No parent node over a nested relationship match!");
const relVar = new cypher_builder_1.default.Relationship();
const relationshipTarget = this.targetOverride ?? this.relationship.target;
const targetNode = (0, create_node_from_entity_1.createNode)(this.alias);
const labels = (0, create_node_from_entity_1.getEntityLabels)(relationshipTarget, context.neo4jGraphQLContext);
const relDirection = this.relationship.getCypherDirection();
const pattern = new cypher_builder_1.default.Pattern(context.target)
.related(relVar, { direction: relDirection, type: this.relationship.type })
.to(targetNode, { labels });
// NOTE: Direction not passed (can we remove it from context?)
const nestedContext = context.push({ target: targetNode, relationship: relVar });
return {
nestedContext: nestedContext,
pattern: pattern,
};
}
}
exports.RelationshipSelectionPattern = RelationshipSelectionPattern;
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