Composing producers
Often you will find that you need to call multiple producers in a sequence in order to get the data you actually want. Maybe because you call a producer that only returns an id
and then you need an entity_load
producer to use that id
to return the actual entity, or maybe a route that returns a URL Object and then you want to take that URL can get the entity out of it using the route_entity
data producer.
This can be accomplished using some of the built-in helpers inside the $builder
object called compose
. given our example for the previous example current_user
, this is how it works :
We are chaining the two data producers together here, one after the other and calling fromParent
will give us the result that was returned in the previous step.
Custom steps
What if we need to do some massaging but not necessarily using any data producer? The $builder
object includes a callback property as well that we can use for this :
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