Symfony3 upload file without using FormBuilder - php

Question

I have a project with files and when I create new project I have form created with FormBuilder and there I have a field from FileType and it is converted then to UploadedFile and it works fine. What I want is to be able to upload after that files without having to edit the project. A simple "Add more files" button. No other fields required and therefore - no need for FormBuilder. Also I don't want to have "save" button after "Add more files" is clicked. I want to click it choose my files and when I click "Open" the form to be submited. This I have achieved with the following code
<form action="{{ path('image_upload', { 'id': project.id }) }}" method="post" name="form">
<div class="col-md-2" id="imageUpload">
<span>Add More Files</span>
<input type="file" readonly="readonly" id="imageUpload" name="image_upload[]" onchange="form.submit()" multiple/><div class="upload_icon"></div>
</div>
</form>
As you can see this form is only with this one button which onChange submits it. My problem is that after submission the files are not UploadedFile type and the Service I have for uploading images doesnot work. I tried creating an instance of UploadedFile on my own but it requires filePath which I have no idea how to take.
This is what is submitted
From this I don't know how to take filePath to actually add it to the constructor of UploadedFile. Also when I debug what happens during creation of the project (where I use FileType) I see that the filePath is "C:\xampp\tmp" which I have no idea from where it comes. My first thought was to simply add it to the constructor of UploadedFile with this code
$file = new UploadedFile("C:\\xampp\\tmp",$file);
When I run it I receive this error -
The file "C:\xampp\tmp" does not exist
So to recap - this is the path which $file->getPath() gives me when I use FileType, but without it when I have simple upload button, it doesnot exist.
At this point I surrendered and was like "Okay...If it wants me to use FormBuilder so badly - then I will". And here is the code in AddFileType (which is related to no entity or anything)
$builder->
add("addFiles",FileType::class,array(
'label'=>'Add More Files',
'multiple'=> true,
'mapped'=> false,
"required"=>false
));
And here is the other problem - I want to be able to submit the form without submit button. Simply when I click "Add More Files" and select some files the form to be submited for me.
My question - Is there a way to get the filePath when using simple upload button and therefore create an instance of UploadedFile and send it to my database from my Service. If not - is there a way with FormBuilder to make it so when FileType button is clicked to submit the form without any submit button required.

Answer 1

I think you need to set mapped to true, because by setting it to false it won't be a relation between this field and the database's field
$builder->
add("addFiles",FileType::class,array(
'label'=>'Add More Files',
'multiple'=> true,
'mapped'=> true,
"required"=>false
));

Answer 2

public function addArticleAction(Request $request){
//get pic from http request
$Image = $this->getRequest()->files->get('artPic');
//generate a unique name for pic
$picName = $this->generateUniqueFileName().'-'.$Image->getClientOriginalName();
//move pic to a directory
$Image->move(
$this->getParameter('pic_directory'),
$picName
);
//store picName in db
$article = new FlashInfo;
$article->setPhoto($picName);
//other data
$request = $request->request->all();
$article->setTitle($request['arTitle']);
$article->setTitle($request['arText']);
$article->setTitle($request['artSource']);
return new Response(json_encode(array('status'=>'success')));
}