title: Error "Conflict resolver rejects mutation." when Delete in Amplify
body: <p>I have a simple full-stack amplify app.</p>
  <p>Here is my model:</p>
  <pre><code>type Note @model @auth(rules: [{allow: public}]) {
    id: ID!
    name: String!
    description: String
    image: String
    NoteType: NoteType @connection
  }
  
  type NoteType @model @auth(rules: [{allow: public}]) {
    id: ID!
    name: String!
  }
  </code></pre>
  <p>I'm trying to delete a Note with the following payload:</p>
  <pre class="lang-json prettyprint-override"><code>{
      &quot;query&quot;: &quot;mutation DeleteNote($input: DeleteNoteInput!, $condition: ModelNoteConditionInput) {↵  deleteNote(input: $input, condition: $condition) {↵    id↵    name↵    description↵    image↵    createdAt↵    updatedAt↵    NoteType {↵      id↵      name↵      createdAt↵      updatedAt↵    }↵  }↵}↵&quot;,
      &quot;variables&quot;: {&quot;input&quot;: {&quot;id&quot;: &quot;0c5e3ced-ffa3-4de8-9010-40b67d5bab68&quot;}}
  }
  </code></pre>
  <p>What I see in the response is the following json:</p>
  <pre class="lang-json prettyprint-override"><code>{
      &quot;data&quot;: {
          &quot;deleteNote&quot;: null
      },
      &quot;errors&quot;: [
          {
              &quot;path&quot;: [
                  &quot;deleteNote&quot;
              ],
              &quot;data&quot;: {
                  &quot;id&quot;: &quot;0c5e3ced-ffa3-4de8-9010-40b67d5bab68&quot;,
                  &quot;name&quot;: &quot;bb&quot;,
                  &quot;description&quot;: &quot;bb&quot;,
                  &quot;image&quot;: &quot;icon.png&quot;,
                  &quot;createdAt&quot;: &quot;2020-12-21T12:00:26.743Z&quot;,
                  &quot;updatedAt&quot;: &quot;2020-12-21T12:00:26.743Z&quot;
              },
              &quot;errorType&quot;: &quot;ConflictUnhandled&quot;,
              &quot;errorInfo&quot;: null,
              &quot;locations&quot;: [
                  {
                      &quot;line&quot;: 1,
                      &quot;column&quot;: 88,
                      &quot;sourceName&quot;: null
                  }
              ],
              &quot;message&quot;: &quot;Conflict resolver rejects mutation.&quot;
          }
      ]
  }
  </code></pre>
  <p>The code was working until I tried to add the <code>NoteType</code>! Is there any conflict regarding the foreign-key here?</p>