How to Customize Import Strategy
In this document, you’ll learn how to create a custom product import strategy either by overriding the default strategy or creating your own.
Overview
Product Import Strategy is essentially a batch job strategy. Medusa provides the necessary mechanisms to override or create your own strategy.
Although this documentation specifically targets import strategies, you can use the same steps to override any batch job strategy in Medusa, including export strategies.
Prerequisites
Medusa Components
It's assumed that you already have a Medusa backend installed and set up. If not, you can follow our quickstart guide to get started. The Medusa backend must also have an event bus module installed, which is available when using the default Medusa backend starter.
Override Batch Job Strategy
The steps required for overriding a batch job strategy are essentially the same steps required to create a batch job strategy with a minor difference. For that reason, this documentation does not cover the basics of a batch job strategy.
If you’re interested to learn more about batch job strategies and how they work, please check out the Create Batch Job Strategy documentation.
1. Create a File
You must store batch job strategies in the src/strategies directory of your Medusa backend. They are either TypeScript or JavaScript files.
So, for example, you can create the file src/strategies/import.ts.
2. Create a Class
The batch job strategy class must extend the AbstractBatchJobStrategy class which you can import from Medusa’s core repository.
For example, you can define the following class in the file you created:
import {
AbstractBatchJobStrategy,
BatchJobService,
} from "@medusajs/medusa"
import { EntityManager } from "typeorm"
class MyImportStrategy extends AbstractBatchJobStrategy {
protected batchJobService_: BatchJobService
protected manager_: EntityManager
protected transactionManager_: EntityManager
processJob(batchJobId: string): Promise<void> {
throw new Error("Method not implemented.")
}
buildTemplate(): Promise<string> {
throw new Error("Method not implemented.")
}
}
export default MyImportStrategy
This is the base implementation of a batch job strategy. You can learn about all the different methods and properties in this documentation.
3. Set the batchType Property
Every batch job strategy class must have the static property batchType defined. It determines the type of batch job this strategy handles.
Since only one batch job strategy can handle a batch job type, you can override Medusa’s default batch job strategies by using the same batchType value in your custom strategy.
So, for example, to override the product import strategy set the batchType property in your strategy to product-import:
4. Define your Custom Functionality
You can now define your custom functionality in your batch job strategy. For example, you can create custom import logic to import products.
Refer to the Create a Batch Job documentation to understand what properties and methods are required in your batch job strategy and how you can use them to implement your custom functionality.
5. Run Build Command
Before you can test out your batch job strategy, you must run the build command:
6. Test your Functionality
Since you didn’t create a new batch job type and overwrote the functionality of the strategy, you can test out your functionality using the same steps used with the default strategy.
Specifically, since you create batch jobs using the Create Batch Job endpoint which accepts the batch job type as a body parameter, you just need to send the same type you used for this field. In the example of this documentation, the type would be product-import.
If you overwrote the import functionality, you can follow these steps to learn how to import products using the Admin APIs.
Create Custom Batch Job Strategy
If you don’t want to override Medusa’s batch job strategy, you can create a custom batch job strategy with a different batchType value. Then, use that type when you send a request to Create a Batch Job.
For more details on creating custom batch job strategies, please check out the Create Batch Job Strategy documentation.