Implementation of ContainsOne (merging models)

.notes.md

#Notes

• uses array spawn to access protected properties - their_field, our_field
• reference::model type Closure not implemented

Form.php

// load the model
$m = new \test\ModelOne($this->app->db);

$m->containsOne('ModelTwo','mt_');

$this->setModel($m, []);

// ModelTwo fields and references are accessible via 
// prefix.field_name => mt_field

Model.php

<?php

namespace test;

class Model extends \atk4\data\Model
{

public function getPrefix($caption)
{
    $caption = str_replace([' ','-'], '_', $caption);
    return strtolower($caption.'_');
}

public function containsOne($refLink, $prefix = null)
{
    $oneModel = $this->refModel($refLink, ['persistence' => $this->persistence]);
    $oneModelRefs = $oneModel->getRefs();
    $oneModelEls = $oneModel->elements;
    $oneModelMap = [];
    $prefix = $prefix ?: $this->getPrefix($oneModel->getModelCaption());
    $oneModelMap['refs'] = [];
    $rf = (Array)$this->getRef($refLink);
    // add all fields
    $oneModelMap['fields'] = [];
    foreach ($oneModelEls as $fieldName => $field) {
        // add fields (not controllers and not foreign key)
        if (strpos($fieldName, '#ref_')===false &&
            $fieldName != 'controller' &&
            $fieldName != $rf["\0*\0".'their_field']
        ) {
            $fname = $prefix.$fieldName;
            $field->never_persist = true;
            $this->add($field, $fname);
            $oneModelMap['fields'][$fieldName] = $fname;
        }
    }
    // add all refs
    foreach ($oneModelRefs as $refName => $ref) {
        // add reference
        $rName = '#ref_'.$prefix.$refName;
        if (!($ref->model instanceof \Closure) && $refName != $rf["\0*\0".'their_field']) {
            $rM = (Array)$ref;
            $oneModelMap['refs'][$rName] = $this->add(
                $this->factory('\\'.get_class($ref), [
                    $prefix.$refName,
                    'model'=>$rM['model'],
                    'our_field'=>$prefix.$rM["\0*\0".'our_field']
                ])
            );
        }
    }
    $this->addHook('afterLoad', function ($m) use ($refLink, $oneModelMap) {
        $r = $m->ref($refLink);
        $rf = (Array)$m->getRef($refLink);
        $r->tryLoadBy($rf["\0*\0".'their_field'], $m[$rf["\0*\0".'our_field']]);
        foreach ($oneModelMap['fields'] as $theirs => $ours) {
            try {
                if($theirs != 'id') {
                    $m[$ours] = $r[$theirs];
                }
            } catch (\atk4\data\Exception $e) {
            }
        }
    }, null, 1);
    $this->addHook('beforeSave', function ($m) use ($refLink, $oneModelMap) {
        $r = $m->ref($refLink);
        foreach ($oneModelMap['fields'] as $theirs => $ours) {
            try {
                if($theirs != $r->id_field){
                    $r[$theirs] = $m[$ours];
                }
            } catch (\atk4\data\Exception $e) {
            }
        }
        $m->addHook('afterSave',function($m2) use ($r, $refLink){
            $rf = (Array)$m2->getRef($refLink);
            $r->addCondition($rf["\0*\0".'their_field'], $m2[$rf["\0*\0".'our_field']]);
            $r->save();
        });
    });
    return $this;
}