insertOnDuplicateKey $updateColumns parameter doesn't allow strings

[nonsapiens]

The insertOnDuplicateKey function works great, except when trying to pass strings in the $updateColumns parameter, as the resulting SQL doesn't enclose the value in quotes to treat them as strings:

SponsoredCallWallet::insertOnDuplicateKey( [ 'msisdn' => $msisdn->toStrict(), 'client_id' => ServiceRequest::client()->id, 'sponsoredcall_campaign_id' => $campaign->id, 'balance' => $duration, 'created_at' => Carbon::now()->format( 'Y-m-d H:i:s' ), 'updated_at' => Carbon::now()->format( 'Y-m-d H:i:s' ), ], [ 'updated_at' => Carbon::now()->format( 'Y-m-d H:i:s' ), 'balance' => 'balance + ' . $duration, ] );

Is there something I'm doing wrong?

[yadakhov]

What error are you getting?