Scope and context

This is the official documentation of the @forestadmin/agent Node.js agent.

Actions can have 3 different scopes: Single, Bulk, and Global.

The scope of an action defines how it can be triggered and which records it will target.

-SingleBulkGlobal

Targeted records

One at a time

All selected and matching the current segment / search

Your choice among all matching the current segment / search

Can be triggered from the List View

When a single record is selected

When one or more records are selected

Can be triggered from the Details View or Summary View

🚫

The context object

The context object is central to writing Actions controllers in Forest Admin.

It is the bridge between all the data that your agent has access to and the action's execution. It is passed to the execute function as the first argument and provides access to the following properties:

  • getRecord() (or getRecords() for Bulk and Global Actions)

  • getRecordId() (or getRecordIds() for Bulk and Global Actions)

  • collection the collection on which the action is declared, which can be queried using the Forest Admin Query Interface.

  • filter a filter that can be used to query the collection, and which is based on action scope and the list of selected records.

  • hasFieldChanged(fieldName) the name of the field who has changed in the UI. See an example of usage

changedField was deprecated in favor of hasFieldChanged(fieldName) starting from @forestadmin/agent@1.28.3 see more information in this issue report ↗.

Example 1: Getting data from the selected records

We can simply use the getRecord() method to get any column from the selected record or a relation.

agent.customizeCollection('customers', collection =>
  collection.addAction('Call me John in the server logs', {
    scope: 'Single',
    execute: async context => {
      // use getRecords() for Bulk and Global Actions
      const { firstName } = await context.getRecord(['firstName']);

      if (firstName === 'John') {
        console.log('Hi John!');
      } else {
        console.error('You are not John!');
      }
    },
  }),
);

Example 2: Updating a field of the selected record

For simple queries, use context.collection and context.filter to query the collection.

Those are instances of objects from the Forest Admin Query Interface.

agent.customizeCollection('companies', collection =>
  collection.addAction('Mark as live', {
    scope: 'Single',
    execute: async context => {
      await context.collection.update(context.filter, { live: true });
    },
  }),
);

Example 3: Coding any business logic

Forest Admin does not impose any restriction on the handler: you are free to write the execute handler to fit your use case.

You are free to call external APIs, query your database, or perform any work in action handlers.

import axios from 'axios';

agent.customizeCollection('companies', collection =>
  collection.addAction('Mark as live', {
    scope: 'Single',
    execute: async context => {
      const url = 'http://my-api.com/mark-as-live';
      const params = { id: await context.getRecordId() };

      await axios.post(url, params);
    },
  }),
);

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