@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
170 lines • 8.16 kB
JavaScript
"use strict";
/*
* 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.DeleteOperation = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const utils_1 = require("../../../../utils/utils");
const wrap_subquery_in_calls_1 = require("../../utils/wrap-subquery-in-calls");
const operations_1 = require("./operations");
class DeleteOperation extends operations_1.MutationOperation {
constructor({ target, selection, nestedOperations = [], filters = [], authFilters = [], }) {
super();
this.target = target;
this.selection = selection;
this.filters = filters;
this.authFilters = authFilters;
this.nestedOperations = nestedOperations;
}
getChildren() {
return [this.selection, ...this.filters, ...this.authFilters, ...this.nestedOperations];
}
transpile(context) {
if (!context.hasTarget()) {
throw new Error("No parent node found!");
}
const { selection, nestedContext } = this.selection.apply(context);
if (nestedContext.relationship) {
return this.transpileNested(selection, nestedContext);
}
return this.transpileTopLevel(selection, nestedContext);
}
/** No need for this, as all auth is done before */
getAuthorizationSubqueries(_context) {
return [];
}
transpileTopLevel(selection, context) {
this.validateSelection(selection);
const filterSubqueries = (0, wrap_subquery_in_calls_1.wrapSubqueriesInCypherCalls)(context, this.filters, [context.target]);
const authBeforeSubqueries = this.getAuthFilterSubqueries(context).map((c) => {
return new cypher_builder_1.default.Call(c, [context.target]);
});
const predicate = this.getPredicate(context);
const validations = this.getValidations(context);
const extraSelections = this.getExtraSelections(context);
const nestedOperations = this.getNestedDeleteSubQueries(context);
let statements = [selection, ...extraSelections, ...filterSubqueries, ...authBeforeSubqueries];
statements = this.appendFilters(statements, predicate);
statements.push(...validations);
if (nestedOperations.length) {
statements.push(new cypher_builder_1.default.With("*"), ...nestedOperations);
}
statements = this.appendDeleteClause(statements, context);
const ret = cypher_builder_1.default.utils.concat(...statements);
return { clauses: [ret], projectionExpr: context.target };
}
transpileNested(selection, context) {
this.validateSelection(selection);
if (!context.relationship) {
throw new Error("Transpile error: No relationship found!");
}
const filterSubqueries = (0, wrap_subquery_in_calls_1.wrapSubqueriesInCypherCalls)(context, this.filters, [context.target]);
const authBeforeSubqueries = this.getAuthFilterSubqueries(context).map((c) => {
return new cypher_builder_1.default.Call(c, [context.target]);
});
const extraSelections = this.getExtraSelections(context);
const predicate = this.getPredicate(context);
const validations = this.getValidations(context);
const collect = cypher_builder_1.default.collect(context.target).distinct();
const deleteVar = new cypher_builder_1.default.Variable();
const withBeforeDeleteBlock = new cypher_builder_1.default.With(context.relationship, [collect, deleteVar]);
const unwindDeleteVar = new cypher_builder_1.default.Variable();
const deleteClause = new cypher_builder_1.default.Unwind([deleteVar, unwindDeleteVar]).detachDelete(unwindDeleteVar);
const deleteBlock = new cypher_builder_1.default.Call(deleteClause, [deleteVar]);
const nestedOperations = this.getNestedDeleteSubQueries(context);
const statements = this.appendFilters([selection, ...extraSelections, ...filterSubqueries, ...authBeforeSubqueries], predicate);
statements.push(...validations);
if (nestedOperations.length) {
statements.push(new cypher_builder_1.default.With("*"), ...nestedOperations);
}
statements.push(withBeforeDeleteBlock, deleteBlock);
const ret = cypher_builder_1.default.utils.concat(...statements);
return { clauses: [ret], projectionExpr: cypher_builder_1.default.Null };
}
appendDeleteClause(clauses, context) {
const lastClause = this.getLastClause(clauses);
if (lastClause instanceof cypher_builder_1.default.Match ||
lastClause instanceof cypher_builder_1.default.OptionalMatch ||
lastClause instanceof cypher_builder_1.default.With) {
lastClause.detachDelete(context.target);
return clauses;
}
const extraWith = new cypher_builder_1.default.With("*");
extraWith.detachDelete(context.target);
clauses.push(extraWith);
return clauses;
}
getLastClause(clauses) {
const lastClause = clauses[clauses.length - 1];
if (!lastClause) {
throw new Error("Transpile error");
}
return lastClause;
}
appendFilters(clauses, predicate) {
if (!predicate) {
return clauses;
}
const lastClause = this.getLastClause(clauses);
if (lastClause instanceof cypher_builder_1.default.Match ||
lastClause instanceof cypher_builder_1.default.OptionalMatch ||
lastClause instanceof cypher_builder_1.default.With) {
lastClause.where(predicate);
return clauses;
}
const withClause = new cypher_builder_1.default.With("*");
withClause.where(predicate);
clauses.push(withClause);
return clauses;
}
getNestedDeleteSubQueries(context) {
const nestedOperations = [];
for (const nestedDeleteOperation of this.nestedOperations) {
const { clauses } = nestedDeleteOperation.transpile(context);
nestedOperations.push(...clauses.map((c) => new cypher_builder_1.default.Call(c, "*")));
}
return nestedOperations;
}
validateSelection(selection) {
if (!(selection instanceof cypher_builder_1.default.Match || selection instanceof cypher_builder_1.default.With)) {
throw new Error("Cypher Yield statement is not a valid selection for Delete Operation");
}
}
getPredicate(queryASTContext) {
const authBeforePredicates = this.getAuthFilterPredicate(queryASTContext);
return cypher_builder_1.default.and(...this.filters.map((f) => f.getPredicate(queryASTContext)), ...authBeforePredicates);
}
getValidations(queryASTContext) {
return (0, utils_1.filterTruthy)(this.authFilters.map((auth) => auth.getValidation(queryASTContext)));
}
getAuthFilterSubqueries(context) {
return this.authFilters.flatMap((f) => f.getSubqueries(context));
}
getAuthFilterPredicate(context) {
return (0, utils_1.filterTruthy)(this.authFilters.map((f) => f.getPredicate(context)));
}
getExtraSelections(context) {
return this.getChildren().flatMap((f) => f.getSelection(context));
}
}
exports.DeleteOperation = DeleteOperation;
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