GroceryCRUD - how to set variables in a callback? (I upload a file, want to resize it 3 times and put all 3 in the db - how do i save that data)?

Question

I am using codeigniter + grocerycrud. I have a callback for image uploads.

I upload one image in the form, but want to do this:

copy it 3 times

resize each one a certain size

then save each one in the database.

any ideas how to do this? The callback only seems to let me edit the image (and do things like that) - not change the varaiables of the submitted data so we can save the manipulated data.

looking at their callback tutorial it looks like most call backs do something like this:

function callback_for_this_field($posted_data) {

$posted_data = $posted_data .= "append me";

return $posted_data;
}

(ie returning the modified data)

but the upload callback just returns true

Answer 1

You can simply do it with a callback_before_insert and callback_before_update. When a file is uploaded in grocery CRUD then a hidden field with value as the name of the file is inserted. So for example let's say you have:

$crud->set_field_upload('image_url','assets/uploads/images');

You can simply do something like this:

$crud->callback_before_insert(array($this,'_append_uploaded_file'));
$crud->callback_before_update(array($this,'_append_uploaded_file'));

and in your Controller add something like:

public function _append_uploaded_file($post_array) 
{
    if (!empty($post_array['image_url'])) {
        $post_array['image_url'] =  "append-me-".$post_array['image_url'];
    }

    //You can add or insert to other tables too

    return $post_array;
}

Of course you can do the same thing with callback_after_insert and callback_after_update without any problem.