title: SaveToDatabase in TYPO3 8
body: <p>How to use form finisher SaveToDataBase in TYPO3 8.7.1? I try to add finisher in YAML, but I have an error:</p>
  
  <blockquote>
    <p>Argument 1 passed to
    TYPO3\CMS\Form\Domain\Finishers\SaveToDatabaseFinisher::process() must
    be of the type integer, string given, called in
    typo3\sysext\form\Classes\Domain\Finishers\SaveToDatabaseFinisher.php
    on line 207</p>
  </blockquote>
  
  <p>YAML document:</p>
  
  <pre><code>renderingOptions:
    submitButtonLabel: Submit
  type: Form
  identifier: form
  label: Form
  prototypeName: standard
  finishers:
    -
      options:
        table: table1
        mode: update
        whereClause:
          uid: '1'
        elements:
          text-1:
            mapOnDatabaseColumn: column1
      identifier: SaveToDatabase
  renderables:
    -
      renderingOptions:
        previousButtonLabel: 'previous Page'
        nextButtonLabel: 'next Page'
      type: Page
      identifier: page-1
      label: Page
      renderables:
        -
          defaultValue: ''
          type: Text
          identifier: text-1
          label: Text
  </code></pre>