@neo4j/graphql
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A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
106 lines • 5.33 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.
*/
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Object.defineProperty(exports, "__esModule", { value: true });
exports.createRelationshipValidationClauses = createRelationshipValidationClauses;
const cypher_builder_1 = __importStar(require("@neo4j/cypher-builder"));
const constants_1 = require("../constants");
const utils_1 = require("../utils/utils");
const create_node_from_entity_1 = require("./queryAST/utils/create-node-from-entity");
const is_interface_entity_1 = require("./queryAST/utils/is-interface-entity");
const is_union_entity_1 = require("./queryAST/utils/is-union-entity");
/**
* Generate cardinality validation as the legacy method create-relationship-validation-string.ts but it uses CypherBuilder and the Schema Model
**/
function createRelationshipValidationClauses({ entity, context, varName, relationshipFieldNotOverwritable, }) {
return (0, utils_1.filterTruthy)([...entity.relationships.values()].map((relationship) => {
const target = relationship.target;
if ((0, is_interface_entity_1.isInterfaceEntity)(target) || (0, is_union_entity_1.isUnionEntity)(target)) {
return;
}
const relVarnameCypher = new cypher_builder_1.default.Relationship();
const predicateAndMessage = getCardinalityPredicateAndMessage(relationship, entity, relationshipFieldNotOverwritable);
if (!predicateAndMessage) {
return;
}
const [predicate, errorMsg] = predicateAndMessage;
const cVariable = new cypher_builder_1.NamedVariable("c");
const predicateCypher = cypher_builder_1.default.not(predicate);
const returnVar = relationship.isList ? cypher_builder_1.default.collect(cVariable) : cVariable;
const match = new cypher_builder_1.default.Match(new cypher_builder_1.default.Pattern(varName)
.related(relVarnameCypher, {
type: relationship.type,
direction: relationship.getCypherDirection(),
})
.to({ labels: (0, create_node_from_entity_1.getEntityLabels)(target, context) }))
.with([cypher_builder_1.default.count(relVarnameCypher), cVariable])
.where(cypher_builder_1.default.apoc.util.validatePredicate(predicateCypher, errorMsg))
.return([returnVar, new cypher_builder_1.default.Variable()]);
return new cypher_builder_1.default.Call(match, [varName]);
}));
}
function getCardinalityPredicateAndMessage(relationship, entity, relationshipFieldNotOverwritable) {
if ((relationship.isList && relationshipFieldNotOverwritable === relationship.name) ||
(!relationship.isList && !relationship.isNullable)) {
return [
cypher_builder_1.default.eq(new cypher_builder_1.NamedVariable("c"), new cypher_builder_1.default.Literal(1)),
`${constants_1.RELATIONSHIP_REQUIREMENT_PREFIX}${entity.name}.${relationship.name} required exactly once`,
];
}
else if (!relationship.isList && relationship.isNullable) {
return [
cypher_builder_1.default.lte(new cypher_builder_1.NamedVariable("c"), new cypher_builder_1.default.Literal(1)),
`${constants_1.RELATIONSHIP_REQUIREMENT_PREFIX}${entity.name}.${relationship.name} must be less than or equal to one`,
];
}
}
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