typeorm
Version:
Data-Mapper ORM for TypeScript and ES2021+. Supports MySQL/MariaDB, PostgreSQL, MS SQL Server, Oracle, SAP HANA, SQLite, MongoDB databases.
56 lines (54 loc) • 3.06 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.RelationCountMetadataToAttributeTransformer = void 0;
const RelationCountAttribute_1 = require("./RelationCountAttribute");
class RelationCountMetadataToAttributeTransformer {
// -------------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------------
constructor(expressionMap) {
this.expressionMap = expressionMap;
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
transform() {
// by example:
// post has relation count:
// @RelationCount(post => post.categories) categoryCount
// category has relation count
// @RelationCount(category => category.images) imageCount
// we load post and join category
// we expect post.categoryCount and post.category.imageCount to have relation counts
// first create relation count attributes for all relation count metadatas of the main selected object (post from example)
if (this.expressionMap.mainAlias) {
this.expressionMap.mainAlias.metadata.relationCounts.forEach((relationCount) => {
const attribute = this.metadataToAttribute(this.expressionMap.mainAlias.name, relationCount);
this.expressionMap.relationCountAttributes.push(attribute);
});
}
// second create relation count attributes for all relation count metadatas of all joined objects (category from example)
this.expressionMap.joinAttributes.forEach((join) => {
// ensure this join has a metadata, because relation count can only work for real orm entities
if (!join.metadata || join.metadata.isJunction)
return;
join.metadata.relationCounts.forEach((relationCount) => {
const attribute = this.metadataToAttribute(join.alias.name, relationCount);
this.expressionMap.relationCountAttributes.push(attribute);
});
});
}
// -------------------------------------------------------------------------
// Private Methods
// -------------------------------------------------------------------------
metadataToAttribute(parentAliasName, relationCount) {
return new RelationCountAttribute_1.RelationCountAttribute(this.expressionMap, {
relationName: parentAliasName + "." + relationCount.relation.propertyName, // category.images
mapToProperty: parentAliasName + "." + relationCount.propertyName, // category.imageIds
alias: relationCount.alias,
queryBuilderFactory: relationCount.queryBuilderFactory,
});
}
}
exports.RelationCountMetadataToAttributeTransformer = RelationCountMetadataToAttributeTransformer;
//# sourceMappingURL=RelationCountMetadataToAttributeTransformer.js.map