Skip to content

Modeling Concepts

Dependency Injection and Parameter Naming

When defining node generators using @model.node, you can request context from parent nodes by adding arguments to your generator function.

Strict Naming Convention: To receive the ID of a parent node, your argument name must follow this pattern: {node_type}_id.

For example, if you have a node type user, a child node generator can request user_id.

1
2
3
4
@model.node(parent_type='user')
def get_posts(user_id):
    # user_id is automatically injected
    ...

Note: Arbitrary arguments are not currently supported. All arguments must match a registered node type followed by _id.

Example

See the following examples for practical usage of this pattern: GitHub Repositories It demonstrates a deep hierarchy using dependency injection.

flowchart LR
    U(user) --> R(repository) --> C(commit) --> F(file)