Field type "Computed" | Voters

Field type "Computed"

Arthur Fontaine

It would be great to be able to add a field that returns a value computed from the other fields without having to create a custom controller and a custom route.

April 28, 2022

Steve Chen

Before we get this, you can use life cycles.
Add a lifecycles.js in your class folder with code like this:
module.exports = {
beforeCreate(event) {
grade = event.params.data.grade;
level  = event.params.data.level;
event.params.data.class_name = G${grade} ${level} 
;
},
beforeUpdate(event) {
grade = event.params.data.grade;
level  = event.params.data.level;
event.params.data.class_name = G${grade} ${level} 
;
},
};

Florent Catiau-Tristant

Steve Chen To complete your answer, this is what I did in the meantime the feature gets prioritized:

Create a new field in my entity as usual. Make it
required
, and possibly
private
if you don't need it to be returned by the api.
Add the lifecycle hooks to automatically update its value based on other entity attributes.
On the Strapi interface, update the "Configuration View" and make that field
not editable
, so that nobody can manually updates this attribute's value from the UI.

Works like a charm for my use case :)