Unable to Retrieve Old Data in Edit Form in Laravel

I want to get data of that id when pressed the edit button. My all fields remain empty. I'm using same page for Create & Edit.

Update Function

 public function update(Request $request)
{

    $user = User::findOrFail($request->user_id);

    $user->update($request->all());

    return back();
}

Edit Button

 <div class="modal fade" id="edit" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                <h4 class="modal-title" id="myModalLabel">Edit user</h4>
            </div>
            <form action="" method="post">
                
                
                <div class="modal-body">
                    <input type="hidden" name="user_id" id="cat_id" value="">
                    @include('admin.form')
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Save Changes</button>
                </div>
            </form>
        </div>
    </div>
</div>

admin.form

<div class="form-group">
                <label for="name">Name</label>
                <input type="text" class="form-control" name="name" id="name">
            </div>

            <div class="form-group">
                <label for="email">Email</label>
                <input type="text" class="form-control" name="email" id="email">
            </div>

I m using same function techniques on some other tables, some are working fine some are not. Can anyone please tell me where I'm doing wrong in this.

via Chebli Mohamed