Laravel 5 - 更新子表

Question

我有这样的数据库设计：

contact_report可以包含许多contact_report_actions。我的表可能看起来像这样

Project

id    | data         | 
----------------------
1     | something    | 
----------------------

document

id    | data         | project_id
---------------------------------
1     | something    | 1
---------------------------------

document_actions

action         | deliveryDate  | documentID
--------------------------------------------
Walk dog       | 01/01/2016    | 1
--------------------------------------------
Wash clothes   | 08/02/2016    | 1
--------------------------------------------
Party          | 09/02/2016    | 1
--------------------------------------------

我在更新contact_report_actions表时遇到了一些问题。目前我正在尝试这样的事情：

public function update(Project $project)
{
    $project->contactReportDoc->discussionPoints = Input::get('discussionPoints');

    $actions = Input::get('actionInput');

    foreach($actions as $action => $input) {
        $contactReportActionsDoc = ContactReportActionsDoc::firstOrNew(['action' => $input["action"]]);
        $contactReportActionsDoc->action = $input["action"];
        $contactReportActionsDoc->responsibility = $input["responsibility"];
        $contactReportActionsDoc->save();
    }

    $project->contactReportDoc->update();
    $projectId = $project->id;

    $contactReportDoc = ContactReportDoc::where('projectId', '=', $projectId)->first();

    return Redirect::route('projects.contactReportDoc.edit', compact('project', 'contactReportDoc'));
}

$actions是用户的输入。我要做的是查看操作是否已存在，如果已存在，请更新它。否则我需要为新操作创建一个新行。我似乎无法将它传递给actions数组并调用此更新，因为它抱怨函数更新不存在。如何更新contact_report_actions表中的行？

由于