fb67d90b64
- Split Module and Module Links to their own chapters - Add new docs on db operations and transactions in modules, multiple services, links with custom columns, etc... - Added a list of registered dependencies in a module container
62 lines
1.7 KiB
Plaintext
62 lines
1.7 KiB
Plaintext
export const metadata = {
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title: `${pageNumber} Module Link Direction`,
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}
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# {metadata.title}
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In this chapter, you'll learn about the difference in module link directions, and which to use based on your use case.
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## Link Direction
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The module link's direction depends on the order you pass the data model configuration parameters to `defineLink`.
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For example, the following defines a link from the `helloModuleService`'s `myCustom` data model to the Product Module's `product` data model:
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```ts
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export default defineLink(
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HelloModule.linkable.myCustom,
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ProductModule.linkable.product
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)
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```
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Whereas the following defines a link from the Product Module's `product` data model to the `helloModuleService`'s `myCustom` data model:
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```ts
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export default defineLink(
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ProductModule.linkable.product,
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HelloModule.linkable.myCustom
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)
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```
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The above links are two different links that serve different purposes.
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---
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## Which Link Direction to Use?
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### Extend Data Models
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If you're adding a link to a data model to extend it and add new fields, define the link from the main data model to the custom data model.
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For example, if the `myCustom` data model adds new fields to the `product` data model, define the link from `product` to `myCustom`:
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```ts
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export default defineLink(
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ProductModule.linkable.product,
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HelloModule.linkable.myCustom
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)
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```
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### Associate Data Models
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If you're linking data models to indicate an association between them, define the link from the custom data model to the main data model.
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For example, if the `myCustom` data model is associated to the `product` data model, define the link from `myCustom` to `product`:
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```ts
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export default defineLink(
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HelloModule.linkable.myCustom,
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ProductModule.linkable.product
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)
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```
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