@forestadmin/datasource-toolkit
Version:
121 lines • 16.2 kB
JavaScript
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const schema_1 = __importDefault(require("./schema"));
const factory_1 = __importDefault(require("../interfaces/query/condition-tree/factory"));
const factory_2 = __importDefault(require("../interfaces/query/filter/factory"));
const unpaginated_1 = __importDefault(require("../interfaces/query/filter/unpaginated"));
const projection_1 = __importDefault(require("../interfaces/query/projection"));
class CollectionUtils {
static getFieldSchema(collection, path) {
const { fields } = collection.schema;
const index = path.indexOf(':');
if (index === -1) {
schema_1.default.throwIfMissingField(collection.schema, path, collection.name);
return fields[path];
}
const associationName = path.substring(0, index);
const schema = schema_1.default.getRelation(collection.schema, associationName, collection.name);
if (schema.type !== 'ManyToOne' && schema.type !== 'OneToOne') {
throw new Error(`Unexpected field type '${schema.type}': '${collection.name}.${associationName}'`);
}
return CollectionUtils.getFieldSchema(collection.dataSource.getCollection(schema.foreignCollection), path.substring(index + 1));
}
static getInverseRelation(collection, relationName) {
const relation = schema_1.default.getRelation(collection.schema, relationName, collection.name);
const foreignCollection = collection.dataSource.getCollection(relation.foreignCollection);
const inverse = Object.entries(foreignCollection.schema.fields).find(([, field]) => {
const isManyToManyInverse = field.type === 'ManyToMany' &&
relation.type === 'ManyToMany' &&
field.originKey === relation.foreignKey &&
field.throughCollection === relation.throughCollection &&
field.foreignKey === relation.originKey;
const isManyToOneInverse = field.type === 'ManyToOne' &&
(relation.type === 'OneToMany' || relation.type === 'OneToOne') &&
field.foreignKey === relation.originKey;
const isOtherInverse = (field.type === 'OneToMany' || field.type === 'OneToOne') &&
relation.type === 'ManyToOne' &&
field.originKey === relation.foreignKey;
return ((isManyToManyInverse || isManyToOneInverse || isOtherInverse) &&
field.foreignCollection === collection.name);
});
return inverse ? inverse[0] : null;
}
static getThroughOrigin(collection, relationName) {
const relation = schema_1.default.getRelation(collection.schema, relationName, collection.name);
if (relation.type !== 'ManyToMany')
throw new Error('Relation must be many to many');
const throughCollection = collection.dataSource.getCollection(relation.throughCollection);
const originRelation = Object.entries(throughCollection.schema.fields).find(([, field]) => {
return (field.type === 'ManyToOne' &&
field.foreignCollection === collection.name &&
field.foreignKey === relation.originKey &&
field.foreignKeyTarget === relation.originKeyTarget);
});
return originRelation ? originRelation[0] : null;
}
static getThroughTarget(collection, relationName) {
const relation = schema_1.default.getRelation(collection.schema, relationName, collection.name);
if (relation.type !== 'ManyToMany')
throw new Error('Relation must be many to many');
const throughCollection = collection.dataSource.getCollection(relation.throughCollection);
const foreignRelation = Object.entries(throughCollection.schema.fields).find(([, field]) => {
return (field.type === 'ManyToOne' &&
field.foreignCollection === relation.foreignCollection &&
field.foreignKey === relation.foreignKey &&
field.foreignKeyTarget === relation.foreignKeyTarget);
});
return foreignRelation ? foreignRelation[0] : null;
}
static async listRelation(collection, id, relationName, caller, foreignFilter, projection) {
const relation = schema_1.default.getToManyRelation(collection.schema, relationName);
// Optimization for many to many when there is not search/segment.
if (relation.type === 'ManyToMany' && foreignFilter.isNestable) {
const foreignRelation = CollectionUtils.getThroughTarget(collection, relationName);
if (foreignRelation) {
const through = collection.dataSource.getCollection(relation.throughCollection);
const records = await through.list(caller, await factory_2.default.makeThroughFilter(collection, id, relationName, caller, foreignFilter), projection.nest(foreignRelation));
// Exclude null records, which may happen in case of a broken relation.
// This happens on databases that don't support enforced foreign keys (e.g. Mongo)
return records.map(r => r[foreignRelation]).filter(Boolean);
}
}
// Otherwise fetch the target table (this works with both relation types)
return collection.dataSource
.getCollection(relation.foreignCollection)
.list(caller, await factory_2.default.makeForeignFilter(collection, id, relationName, caller, foreignFilter), projection);
}
static async aggregateRelation(collection, id, relationName, caller, foreignFilter, aggregation, limit) {
const relation = schema_1.default.getToManyRelation(collection.schema, relationName);
// Optimization for many to many when there is not search/segment (saves one query)
if (relation.type === 'ManyToMany' && foreignFilter.isNestable) {
const foreignRelation = CollectionUtils.getThroughTarget(collection, relationName);
if (foreignRelation) {
const through = collection.dataSource.getCollection(relation.throughCollection);
const records = await through.aggregate(caller, await factory_2.default.makeThroughFilter(collection, id, relationName, caller, foreignFilter), aggregation.nest(foreignRelation), limit);
// unnest aggregation result
return records.map(({ value, group }) => ({
value,
group: Object.entries(group)
.map(([key, v]) => [key.substring(key.indexOf(':') + 1), v])
.reduce((memo, [key, v]) => ({ ...memo, [key]: v }), {}),
}));
}
}
// Otherwise fetch the target table (this works with both relation types)
return collection.dataSource
.getCollection(relation.foreignCollection)
.aggregate(caller, await factory_2.default.makeForeignFilter(collection, id, relationName, caller, foreignFilter), aggregation, limit);
}
static async getValue(collection, caller, id, field) {
const index = schema_1.default.getPrimaryKeys(collection.schema).indexOf(field);
if (index !== -1)
return id[index];
const [record] = await collection.list(caller, new unpaginated_1.default({ conditionTree: factory_1.default.matchIds(collection.schema, [id]) }), new projection_1.default(field));
return record[field];
}
}
exports.default = CollectionUtils;
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;