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On this page
  • Disabling operators
  • Substitution
  • Operators to support to enable the search
  • Emulation

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  1. Agent customization
  2. Fields

Override filtering behavior

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Last updated 11 months ago

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

You may want to read about the following topics before using those features:

Disabling operators

Disabling filtering can be made without any code .

Substitution

Operation substitution can be used for two motives:

  • Performance: provide a more efficient way to perform a given filtering operation

  • Capabilities: enable filtering on a computed field or other non-filterable fields

collection.replaceFieldOperator('fullName', 'Equal', (value, context) => {
  const [firstName, ...lastNames] = value.split(' ');

  return {
    aggregator: 'And',
    conditions: [
      { field: 'firstName', operator: 'Equal', value: firstName },
      { field: 'lastName', operator: 'Equal', value: lastNames.join(' ') },
    ],
  };
});

Operators to support to enable the search

Column Type
Operator to support

Number

Equal

Enum

Equal

String

IContains OR Contains OR Equal

Uuid

Equal

Emulation

Filtering emulation allows making fields filterable automatically. It is a convenient way to get things working quickly for Collections that have a low number of records (in the thousands at most).

This emulation forces the Agent to retrieve all the Collection records and compute the field values for each one of them. As a consequence, filtering emulation performance cost is linear with the number of records in the Collection, so activate it sparingly and with great care.

// Add support for all operators
collection.emulateFieldFiltering('fullName');

// Add support for a single operator
collection.emulateFieldOperator('fullName', 'Equal');

You can use the method to unlock the operators.

replaceFieldOperator
in the field settings ↗
Structure of a ConditionTree
List of all filtering Operators
Operator equivalence system
Unlocking filtering, scopes, and segments on the UI