@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
60 lines • 2.5 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.CypherAttributeOperation = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const operations_1 = require("./operations");
/**
* This operation is used to return top-level and nested @cypher fields that returns a scalar value.
**/
class CypherAttributeOperation extends operations_1.Operation {
constructor(selection, cypherAttributeField, isNested) {
super();
this.selection = selection;
this.cypherAttributeField = cypherAttributeField;
this.isNested = isNested;
}
getChildren() {
return [this.selection];
}
transpile(context) {
const { selection: matchClause, nestedContext } = this.selection.apply(context);
let retProj;
if (this.isNested && this.cypherAttributeField.typeHelper.isList()) {
retProj = [cypher_builder_1.default.collect(nestedContext.returnVariable), context.returnVariable];
}
else {
retProj = [nestedContext.returnVariable, context.returnVariable];
}
const scope = context.getTargetScope();
// by setting the return variable of this operation in the attribute scope, we can avoid duplicate the same cypher resolution for sorting and projection purposes
scope.set(this.cypherAttributeField.name, context.returnVariable);
const clause = matchClause.return(retProj);
return {
clauses: [clause],
projectionExpr: context.returnVariable,
};
}
}
exports.CypherAttributeOperation = CypherAttributeOperation;
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