CakePHP 3: How to save model and field name in associated table?

[Salines]

I need a hint.

I have to develop a number of centralized models, which will be in relation 
to other models. 
Examples of such models are Timelines and Images, which secound have 
fields: 

id, 
model, // Model name, ex Users
field, // field name, from where upload
foreign_key, // User Id
descripton..


UsersTable example: 

        $this->hasOne('Cover',[
            'className' => 'Images',
            'foreignKey' => 'foreign_key',
            'conditions' => [
                'model' => 'Users',
                'field' => 'cover'
            ]
        ]);

        $this->hasOne('Avatar',[
            'className' => 'Images',
            'foreignKey' => 'foreign_key',
            'conditions' => [
                'model' => Users',
                'field' => 'avatar'
            ]
        ]);
        $this->hasMany('Images',[
            'className' => 'Images',
            'foreignKey' => 'foreign_key',
            'conditions' => [
                'model' => 'Users',
                'field' => 'images'
            ]
        ]);

<?= $this->Form->input('cover.cover',[ 'type' => 'file', 'label' => 
false]); ?>
<?= $this->Form->input(avatar.avatar',[ 'type' => 'file', 'label' => 
false]); ?>
<?= $this->Form->input('images[].images',[ 'type' => 'file', 'multiple' => 
true, 'label' => false]); ?>


How to in beforeMarshal or beforeSave methods on ImagesTable or Behavior 
retrieve model name from which is uploaded images, example Users, Posts,.., 
and store in images tables?

Currently I am migrating from 2.x to 3.x, I have a lot to learn.

Thanks.

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