forked from typeorm/typeorm
/
FindOptionsUtils.ts
256 lines (213 loc) · 10.9 KB
/
FindOptionsUtils.ts
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import {FindManyOptions} from "./FindManyOptions";
import {FindOneOptions} from "./FindOneOptions";
import {SelectQueryBuilder} from "../query-builder/SelectQueryBuilder";
import {FindRelationsNotFoundError} from "../error/FindRelationsNotFoundError";
import {EntityMetadata} from "../metadata/EntityMetadata";
import {shorten} from "../util/StringUtils";
/**
* Utilities to work with FindOptions.
*/
export class FindOptionsUtils {
// -------------------------------------------------------------------------
// Public Static Methods
// -------------------------------------------------------------------------
/**
* Checks if given object is really instance of FindOneOptions interface.
*/
static isFindOneOptions(obj: any): obj is FindOneOptions<any> {
const possibleOptions: FindOneOptions<any> = obj;
return possibleOptions &&
(
Array.isArray(possibleOptions.select) ||
possibleOptions.where instanceof Object ||
typeof possibleOptions.where === "string" ||
Array.isArray(possibleOptions.relations) ||
possibleOptions.join instanceof Object ||
possibleOptions.order instanceof Object ||
possibleOptions.cache instanceof Object ||
typeof possibleOptions.cache === "boolean" ||
typeof possibleOptions.cache === "number" ||
possibleOptions.lock instanceof Object ||
possibleOptions.loadRelationIds instanceof Object ||
typeof possibleOptions.loadRelationIds === "boolean" ||
typeof possibleOptions.loadEagerRelations === "boolean" ||
typeof possibleOptions.withDeleted === "boolean"
);
}
/**
* Checks if given object is really instance of FindManyOptions interface.
*/
static isFindManyOptions(obj: any): obj is FindManyOptions<any> {
const possibleOptions: FindManyOptions<any> = obj;
return possibleOptions && (
this.isFindOneOptions(possibleOptions) ||
typeof (possibleOptions as FindManyOptions<any>).skip === "number" ||
typeof (possibleOptions as FindManyOptions<any>).take === "number" ||
typeof (possibleOptions as FindManyOptions<any>).skip === "string" ||
typeof (possibleOptions as FindManyOptions<any>).take === "string"
);
}
/**
* Checks if given object is really instance of FindOptions interface.
*/
static extractFindManyOptionsAlias(object: any): string|undefined {
if (this.isFindManyOptions(object) && object.join)
return object.join.alias;
return undefined;
}
/**
* Applies give find many options to the given query builder.
*/
static applyFindManyOptionsOrConditionsToQueryBuilder<T>(qb: SelectQueryBuilder<T>, options: FindManyOptions<T>|Partial<T>|undefined): SelectQueryBuilder<T> {
if (this.isFindManyOptions(options))
return this.applyOptionsToQueryBuilder(qb, options);
if (options)
return qb.where(options);
return qb;
}
/**
* Applies give find options to the given query builder.
*/
static applyOptionsToQueryBuilder<T>(qb: SelectQueryBuilder<T>, options: FindOneOptions<T>|FindManyOptions<T>|undefined): SelectQueryBuilder<T> {
// if options are not set then simply return query builder. This is made for simplicity of usage.
if (!options || (!this.isFindOneOptions(options) && !this.isFindManyOptions(options)))
return qb;
if (!qb.expressionMap.mainAlias || !qb.expressionMap.mainAlias.hasMetadata)
return qb;
const metadata = qb.expressionMap.mainAlias!.metadata;
// apply all options from FindOptions
if (options.select) {
qb.select([]);
options.select.forEach(select => {
if (!metadata.findColumnWithPropertyPath(String(select)))
throw new Error(`${select} column was not found in the ${metadata.name} entity.`);
qb.addSelect(qb.alias + "." + select);
});
}
if (options.where)
qb.where(options.where);
if ((options as FindManyOptions<T>).skip)
qb.skip((options as FindManyOptions<T>).skip!);
if ((options as FindManyOptions<T>).take)
qb.take((options as FindManyOptions<T>).take!);
if (options.order)
Object.keys(options.order).forEach(key => {
const order = ((options as FindOneOptions<T>).order as any)[key as any];
if (!metadata.findColumnWithPropertyPath(key))
throw new Error(`${key} column was not found in the ${metadata.name} entity.`);
switch (order) {
case 1:
qb.addOrderBy(qb.alias + "." + key, "ASC");
break;
case -1:
qb.addOrderBy(qb.alias + "." + key, "DESC");
break;
case "ASC":
qb.addOrderBy(qb.alias + "." + key, "ASC");
break;
case "DESC":
qb.addOrderBy(qb.alias + "." + key, "DESC");
break;
}
});
if (options.relations) {
const allRelations = options.relations.map(relation => relation);
this.applyRelationsRecursively(qb, allRelations, qb.expressionMap.mainAlias!.name, qb.expressionMap.mainAlias!.metadata, "");
// recursive removes found relations from allRelations array
// if there are relations left in this array it means those relations were not found in the entity structure
// so, we give an exception about not found relations
if (allRelations.length > 0)
throw new FindRelationsNotFoundError(allRelations);
}
if (options.join) {
if (options.join.leftJoin)
Object.keys(options.join.leftJoin).forEach(key => {
qb.leftJoin(options.join!.leftJoin![key], key);
});
if (options.join.innerJoin)
Object.keys(options.join.innerJoin).forEach(key => {
qb.innerJoin(options.join!.innerJoin![key], key);
});
if (options.join.leftJoinAndSelect)
Object.keys(options.join.leftJoinAndSelect).forEach(key => {
qb.leftJoinAndSelect(options.join!.leftJoinAndSelect![key], key);
});
if (options.join.innerJoinAndSelect)
Object.keys(options.join.innerJoinAndSelect).forEach(key => {
qb.innerJoinAndSelect(options.join!.innerJoinAndSelect![key], key);
});
}
if (options.cache) {
if (options.cache instanceof Object) {
const cache = options.cache as { id: any, milliseconds: number };
qb.cache(cache.id, cache.milliseconds);
} else {
qb.cache(options.cache);
}
}
if (options.lock) {
if (options.lock.mode === "optimistic") {
qb.setLock(options.lock.mode, options.lock.version as any);
} else if (options.lock.mode === "pessimistic_read" || options.lock.mode === "pessimistic_write" || options.lock.mode === "dirty_read" || options.lock.mode === "pessimistic_partial_write" || options.lock.mode === "pessimistic_write_or_fail") {
qb.setLock(options.lock.mode);
}
}
if (options.withDeleted) {
qb.withDeleted();
}
if (options.loadRelationIds === true) {
qb.loadAllRelationIds();
} else if (options.loadRelationIds instanceof Object) {
qb.loadAllRelationIds(options.loadRelationIds as any);
}
return qb;
}
// -------------------------------------------------------------------------
// Protected Static Methods
// -------------------------------------------------------------------------
/**
* Adds joins for all relations and sub-relations of the given relations provided in the find options.
*/
protected static applyRelationsRecursively(qb: SelectQueryBuilder<any>, allRelations: string[], alias: string, metadata: EntityMetadata, prefix: string): void {
// find all relations that match given prefix
let matchedBaseRelations: string[] = [];
if (prefix) {
const regexp = new RegExp("^" + prefix.replace(".", "\\.") + "\\.");
matchedBaseRelations = allRelations
.filter(relation => relation.match(regexp))
.map(relation => relation.replace(regexp, ""))
.filter(relation => metadata.findRelationWithPropertyPath(relation));
} else {
matchedBaseRelations = allRelations.filter(relation => metadata.findRelationWithPropertyPath(relation));
}
// go through all matched relations and add join for them
matchedBaseRelations.forEach(relation => {
// generate a relation alias
let relationAlias: string = alias + "__" + relation;
// shorten it if needed by the driver
if (qb.connection.driver.maxAliasLength && relationAlias.length > qb.connection.driver.maxAliasLength) {
relationAlias = shorten(relationAlias);
}
// add a join for the found relation
const selection = alias + "." + relation;
qb.leftJoinAndSelect(selection, relationAlias);
// join the eager relations of the found relation
const relMetadata = metadata.relations.find(metadata => metadata.propertyName === relation);
if (relMetadata) {
this.joinEagerRelations(qb, relationAlias, relMetadata.inverseEntityMetadata);
}
// remove added relations from the allRelations array, this is needed to find all not found relations at the end
allRelations.splice(allRelations.indexOf(prefix ? prefix + "." + relation : relation), 1);
// try to find sub-relations
const join = qb.expressionMap.joinAttributes.find(join => join.entityOrProperty === selection);
this.applyRelationsRecursively(qb, allRelations, join!.alias.name, join!.metadata!, prefix ? prefix + "." + relation : relation);
});
}
public static joinEagerRelations(qb: SelectQueryBuilder<any>, alias: string, metadata: EntityMetadata) {
metadata.eagerRelations.forEach(relation => {
const relationAlias = qb.connection.namingStrategy.eagerJoinRelationAlias(alias, relation.propertyPath);
qb.leftJoinAndSelect(alias + "." + relation.propertyPath, relationAlias);
this.joinEagerRelations(qb, relationAlias, relation.inverseEntityMetadata);
});
}
}