title: Vue warn: Computed property "projectName" was assigned to but it has no setter
body: <p>I am trying to fill form with data with Vuex and after that edit it in the same form, but not working at the moment.</p>
  
  <p>This is the code:</p>
  
  <pre><code>&lt;template&gt;
    &lt;v-dialog v-model="dialogEditProject" max-width="1200px" height="200px"&gt;
      &lt;v-card&gt;
        &lt;v-card-title class="head-modal"&gt;
          &lt;v-list-item-avatar class="logo-modal"&gt;
            &lt;v-img src="@/assets/logo.svg"&gt;&lt;/v-img&gt;
          &lt;/v-list-item-avatar&gt;
          &lt;span class="title-modal"&gt;EDIT PROJECT&lt;/span&gt;
        &lt;/v-card-title&gt;
        &lt;v-form ref="form" v-model="valid" onSubmit="return false;" lazy-validation&gt;
          &lt;v-row no-gutters&gt;
            &lt;v-col class="col1" cols="4"&gt;
              &lt;span class="login-txt"&gt;Name Project&lt;/span&gt;
              &lt;v-row&gt;
                &lt;v-text-field
                  v-model="projectName"
                  @change="updateMessage"
                  label
                  :rules="nameProjectRules"
                  solo
                  name
                  required
                  shaped
                /&gt;
              &lt;/v-row&gt;
              &lt;span class="name-project"&gt;{{ projectName }}&lt;/span&gt;&lt;br&gt;
              &lt;span class="login-txt"&gt;Author&lt;/span&gt;
              &lt;v-row&gt;
                &lt;v-text-field
                  v-model="authorProject"
                  label
                  :rules="authorProjectRules"
                  solo
                  name
                  required
                  shaped
                /&gt;
              &lt;/v-row&gt;
  
              &lt;v-card-actions class="btn-new-project-modal"&gt;
                &lt;v-btn id="btn-cancel-modal" class="btn-secondary" text @click="close"&gt;Cancel&lt;/v-btn&gt;
                &lt;v-btn
                  id="btn-create-modal"
                  class="btn-primary"
                  :disabled="!valid"
                  type="submit"
                  @click="updateProject"
                  &gt;Update&lt;/v-btn
                &gt;
              &lt;/v-card-actions&gt;
            &lt;/v-col&gt;
        &lt;/v-form&gt;
      &lt;/v-card&gt;
    &lt;/v-dialog&gt;
   &lt;/template&gt;
  </code></pre>
  
  <p>and JS:</p>
  
  <pre><code>    computed: {
      ...mapState('projects', ['projectName', 'authorProject', 'projectUuid']),
    },
  </code></pre>
  
  <p>Now in the text field appear the projectName, but when I try to do a PUT, not modify the field.
  Any idea to fix that?</p>
  
  <p>Thanks a lot</p>