@loopback/repository
Version:
Define and implement a common set of interfaces for interacting with databases
87 lines • 3.62 kB
JavaScript
;
// Copyright IBM Corp. and LoopBack contributors 2019. All Rights Reserved.
// Node module: @loopback/repository
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.resolveBelongsToMetadata = void 0;
const tslib_1 = require("tslib");
const debug_1 = tslib_1.__importDefault(require("debug"));
const lodash_1 = require("lodash");
const errors_1 = require("../../errors");
const type_resolver_1 = require("../../type-resolver");
const relation_types_1 = require("../relation.types");
const debug = (0, debug_1.default)('loopback:repository:relations:belongs-to:helpers');
/**
* Resolves given belongsTo metadata if target is specified to be a resolver.
* Mainly used to infer what the `keyTo` property should be from the target's
* property id metadata
* @param relationMeta - belongsTo metadata to resolve
* @internal
*/
function resolveBelongsToMetadata(relationMeta) {
if (relationMeta.type !== relation_types_1.RelationType.belongsTo) {
const reason = 'relation type must be BelongsTo';
throw new errors_1.InvalidRelationError(reason, relationMeta);
}
if (!(0, type_resolver_1.isTypeResolver)(relationMeta.target)) {
const reason = 'target must be a type resolver';
throw new errors_1.InvalidRelationError(reason, relationMeta);
}
const sourceModel = relationMeta.source;
if (!(sourceModel === null || sourceModel === void 0 ? void 0 : sourceModel.modelName)) {
const reason = 'source model must be defined';
throw new errors_1.InvalidRelationError(reason, relationMeta);
}
const targetModel = relationMeta.target();
const targetName = targetModel.modelName;
debug('Resolved model %s from given metadata: %o', targetName, targetModel);
let keyFrom;
if (relationMeta.keyFrom &&
relationMeta.source.definition.properties[relationMeta.keyFrom]) {
keyFrom = relationMeta.keyFrom;
}
else {
keyFrom = (0, lodash_1.camelCase)(targetName + '_id');
}
const targetProperties = targetModel.definition.properties;
debug('relation metadata from %o: %o', targetName, targetProperties);
let keyTo;
if (relationMeta.keyTo && targetProperties[relationMeta.keyTo]) {
// The explicit cast is needed because of a limitation of type inference
keyTo = relationMeta.keyTo;
}
else {
keyTo = targetModel.definition.idProperties()[0];
if (!keyTo) {
const reason = `${targetName} does not have any primary key (id property)`;
throw new errors_1.InvalidRelationError(reason, relationMeta);
}
}
let polymorphic;
if (relationMeta.polymorphic === undefined ||
relationMeta.polymorphic === false ||
!relationMeta.polymorphic) {
const polymorphicFalse = false;
polymorphic = polymorphicFalse;
}
else {
if (relationMeta.polymorphic === true) {
const polymorphicObject = {
discriminator: (0, lodash_1.camelCase)(relationMeta.target().name + '_type'),
};
polymorphic = polymorphicObject;
}
else {
const polymorphicObject = relationMeta.polymorphic;
polymorphic = polymorphicObject;
}
}
return Object.assign(relationMeta, {
keyFrom,
keyTo: keyTo,
polymorphic: polymorphic,
});
}
exports.resolveBelongsToMetadata = resolveBelongsToMetadata;
//# sourceMappingURL=belongs-to.helpers.js.map