4.1 KiB
BelongsToManyRepository
BelongsToManyRepository is the Relation Repository for handling BelongsToMany relationships.
Unlike other relationship types, the BelongsToMany type of relationship needs to be recorded through an intermediate table. The intermediate table can be created automatically or explicitly specified when defining association relationships in NocoBase.
Class Methods
find()
Find associated objects.
Signature
async find(options?: FindOptions): Promise<M[]>
Detailed Information
Query parameters are the same as Repository.find().
findOne()
Find associated objects, only to return one record.
Signature
async findOne(options?: FindOneOptions): Promise<M>
count()
Return the number of records matching the query criteria.
Signature
async count(options?: CountOptions)
Type
interface CountOptions extends Omit<SequelizeCountOptions, 'distinct' | 'where' | 'include'>, Transactionable {
filter?: Filter;
}
findAndCount()
Find datasets from the database with the specified filtering conditions and return the number of results.
Signature
async findAndCount(options?: FindAndCountOptions): Promise<[any[], number]>
Type
type FindAndCountOptions = CommonFindOptions
create()
Create associated objects.
Signature
async create(options?: CreateOptions): Promise<M>
update()
Update associated objects that match the conditions.
Signature
async update(options?: UpdateOptions): Promise<M>
destroy()
Delete associated objects.
Signature
async destroy(options?: TargetKey | TargetKey[] | DestroyOptions): Promise<Boolean>
add()
Add new associated objects.
Signature
async add( options: TargetKey | TargetKey[] | PrimaryKeyWithThroughValues | PrimaryKeyWithThroughValues[] | AssociatedOptions ): Promise<void>
Type
type PrimaryKeyWithThroughValues = [TargetKey, Values];
interface AssociatedOptions extends Transactionable {
tk?: TargetKey | TargetKey[] | PrimaryKeyWithThroughValues | PrimaryKeyWithThroughValues[];
}
Detailed Information
Pass the targetKey of the associated object directly, or pass the targetKey along with the field values of the intermediate table.
Example
const t1 = await Tag.repository.create({
values: { name: 't1' },
});
const t2 = await Tag.repository.create({
values: { name: 't2' },
});
const p1 = await Post.repository.create({
values: { title: 'p1' },
});
const PostTagRepository = new BelongsToManyRepository(Post, 'tags', p1.id);
// Pass in the targetKey
PostTagRepository.add([
t1.id, t2.id
]);
// Pass in intermediate table fields
PostTagRepository.add([
[t1.id, { tagged_at: '123' }],
[t2.id, { tagged_at: '456' }],
]);
set()
Set the associated objects.
Signature
- async set( options: TargetKey | TargetKey[] | PrimaryKeyWithThroughValues | PrimaryKeyWithThroughValues[] | AssociatedOptions, ): Promise
Detailed Information
Parameters are the same as add().
remove()
Remove the association with the given objects.
Signature
async remove(options: TargetKey | TargetKey[] | AssociatedOptions)
Type
interface AssociatedOptions extends Transactionable {
tk?: TargetKey | TargetKey[];
}
toggle()
Toggle the associated object.
In some business scenarios, it is often needed to toggle the associated object. For example, user adds a product into collection, and the user cancels the collection and collect it again. Using the toggle method can quickly implement similar functions.
Signature
async toggle(options: TargetKey | { tk?: TargetKey; transaction?: Transaction }): Promise<void>
Detailed Information
The toggle method automatically checks whether the associated object already exists, and removes it if it does, or adds it if it does not.