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One great feature of a related model’s repository is its ability to expose a factory function (a function that returns a newly instantiated object) to return a ‘constrained’ version of the related model’s repository. A factory function is useful because it allows you to create a repository whose operations are limited by the data set that applies to the factory function.

In this section, we’ll build TodoListRepository to have the capability of building a constrained version of TodoRepository.

Create your repository

From inside the project folder, run the lb4 repository command to create a repository for the TodoList model using the db datasource. The db datasource shows up by its class name DbDataSource from the list of available datasources.

lb4 repository
? Please select the datasource DbDatasource
? Select the model(s) you want to generate a repository TodoList
? Please select the repository base class DefaultCrudRepository (Juggler bridge)
   create src/repositories/todo-list.repository.ts
   update src/repositories/index.ts

Repository TodoListRepository was created in src/repositories/

Custom Methods

A custom method can be added to the repository class. For example, if we want to find a TodoList with a specific title from the repository level, the following method can be added:

export class TodoListRepository extends DefaultCrudRepository<
> {
  // other code

  // Add the following function
  public findByTitle(title: string) {
    return this.findOne({where: {title}});

To view the completed file, see the TodoList example.

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