Difficulties in creating update with Laravel 5.1 - php

Question

I'm trying to create an update with Laravel 5.1 but it shows the error:
I have 2 updates in this method and I noticed that the error already happens in the first one
Type error: Argument 1 passed to
Illuminate\Database\Eloquent\Builder::update() must be of the type
array, null given
My Controller
public function update($id)
{
$dadosForm = $this->request->except('_token');
$dadosForm = $this->request->offsetUnset('fat_cnpj');
$dadosForm = $this->request->offsetUnset('vatendimento');
$dadosForm = $this->request->offsetUnset('integra');
$dadosForm = $this->request->offsetUnset('material');
$proposta = $this->proposta;
$proposta->cliente_id = $this->request->get('cliente_id');
$proposta->contato = $this->request->get('contato');
$proposta->email = $this->request->get('email');
$proposta->telefone = $this->request->get('telefone');
$proposta->fatcnpj = $this->request->get('fatcnpj');
$proposta->atendimento = $this->request->get('atendimento');
$proposta->dt_solicitacao = $this->request->get('dt_solicitacao');
$proposta->dt_vigencia = $this->request->get('dt_vigencia');
$proposta->vendedor = $this->request->get('vendedor');
$proposta->coleta = $this->request->get('coleta');
$proposta->dt_integracao = $this->request->get('dt_integracao');
$proposta->hr_integracao = $this->request->get('hr_integracao');
$proposta->frete_material = $this->request->get('frete_material');
$proposta->status_id = $this->request->get('status_id');
$this->proposta->where('id', $id)->update($dadosForm);
$proposta_id = $id;
$count = $this->ensaios->max('id');
for($i=1;$i<=$count;$i++){ //Save Ensaios
$proposta_ensaios = new PropostaEnsaios();
$proposta_ensaios->id_proposta = $proposta_id;
$proposta_ensaios->id_produto = $i;
$proposta_ensaios->quantidade = $dadosForm['quantidade_'.$i];
$proposta_ensaios->valor= $dadosForm['valor_'.$i];
$proposta_ensaios->total = $dadosForm['total_'.$i];
$proposta_ensaios->where('id', $id)->update($dadosForm);
}
$this->request->session()->flash('alert-success', 'Dados Alterados com Sucesso!');
return redirect()->route('manage-content');
}

Answer 1

You're setting the $dadosForm variable to NULL in the last four lines of:
$dadosForm = $this->request->except('_token');
$dadosForm = $this->request->offsetUnset('fat_cnpj');
$dadosForm = $this->request->offsetUnset('vatendimento');
$dadosForm = $this->request->offsetUnset('integra');
$dadosForm = $this->request->offsetUnset('material');
(For reference PHP will return a NULL value from functions which don't specify a return - as offsetUnset doesn't.) I believe you're intending to do something more like:
$this->request->offsetUnset('fat_cnpj');
$this->request->offsetUnset('vatendimento');
$this->request->offsetUnset('integra');
$this->request->offsetUnset('material');
$dadosForm = $this->request->except('_token');