@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
87 lines • 3.44 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.CompositeReadOperation = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const operations_1 = require("../operations");
class CompositeReadOperation extends operations_1.Operation {
constructor({ compositeEntity, children, relationship, }) {
super();
this.sortFields = [];
this.entity = compositeEntity;
this.children = children;
this.relationship = relationship;
}
getChildren() {
return this.children;
}
transpile(context) {
const parentNode = context.target;
const nestedSubqueries = this.children.flatMap((c) => {
const result = c.transpile(context);
let clauses = result.clauses;
if (parentNode) {
clauses = clauses.map((sq) => cypher_builder_1.default.utils.concat(new cypher_builder_1.default.With("*"), sq));
}
return clauses;
});
let aggrExpr = cypher_builder_1.default.collect(context.returnVariable);
if (!this.relationship) {
aggrExpr = context.returnVariable;
}
if (this.relationship && !this.relationship.isList) {
aggrExpr = cypher_builder_1.default.head(aggrExpr);
}
const nestedSubquery = new cypher_builder_1.default.Call(new cypher_builder_1.default.Union(...nestedSubqueries), "*").with(context.returnVariable);
if (this.sortFields.length > 0) {
nestedSubquery.orderBy(...this.getSortFields(context, context.returnVariable));
}
if (this.pagination) {
const paginationField = this.pagination.getPagination();
if (paginationField) {
if (paginationField.skip) {
nestedSubquery.skip(paginationField.skip);
}
if (paginationField.limit) {
nestedSubquery.limit(paginationField.limit);
}
}
}
nestedSubquery.return([aggrExpr, context.returnVariable]);
return {
clauses: [nestedSubquery],
projectionExpr: context.returnVariable,
};
}
addPagination(pagination) {
this.pagination = pagination;
}
addSort(...sortElement) {
this.sortFields.push(...sortElement);
}
getSortFields(context, target) {
return this.sortFields.flatMap((sf) => sf.getSortFields(context, target, false));
}
}
exports.CompositeReadOperation = CompositeReadOperation;
//# sourceMappingURL=CompositeReadOperation.js.map