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NgRest Pools

See luya\admin\ngrest\base\NgRestModel -> ngRestPools().

Define data pools

INFO

The difference between luya\admin\ngrest\base\NgRestModel -> ngRestFilters() and luya\admin\ngrest\base\NgRestModel -> ngRestPools() is that the pool identifier must be provided in the menu component and is not visible in the UI, it is like an invisible filter, only available to developers.

A data pool can be used to retrieve only a subset of data. The identifier for the pool is passed trough to all subrelation calls. Related models will filter their data by the same pool identifier, if configured accordingly.

The following is an example of a pool identifier for a table with cars:

php
return [
    'poolAudi' => ['car_brand' => 'Audi'],
    'poolBMW' => ['car_brand' => 'BMW'],
];

If the pool identifier is defined in the menu, all subrelation calls will receive the identifier. Therefore, in the above example, you could have a model for car parts that only returns parts with the same pool identifier in relation calls:

php
return [
    'poolAudi' => ['parts_brand' => 'Audi'],
    'poolBMW' => ['parts_brand' => 'BMW'],
];

The identifiers poolAudi and poolBMW are passed to the parts table to only return parts for the given car brand.

TIP

The pool condition is threaded as where condition, the above example would be where(['car_brand' => 'BMW']). Only hash format expression with "equal" operators are allowed.