Answers.Body: <p>I believe we figured this out over Slack, but the issue here was that you need to actually import your <code>Line Id</code> column into your <code>lineId</code> field, otherwise Feed Me doesn't know anything about that.</p>
  
  <p>The checkbox to tell Feed Me to use a certain field's value to match existing elements on is one half of the problem - you've already correctly chosen <code>Line Id</code>. The issue is you need the other half - what data in your feed is supposed to match up with <code>Line Id</code> and <code>lineId</code>.</p>
  
  <p>I suppose a less confusing UI would be to have an accompanying dropdown field near those checkboxes to say which bit of data in your feed should you be comparing with.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-05-03T13:55:44.717Z
Answers.Text: Yep - everything is working.  I am closing it now.  Thanks again!
Answers.UserDisplayName: Hellyar
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-05-02T22:36:32.470Z
Answers.LastActivityDate: 2018-05-02T22:36:32.470Z
Answers.UserDisplayName: crawf
Body: <p>I am trying to use the <strong>FeedMe</strong> plugin to append data to existing entries.</p>
  
  <p>My existing entries have a field that is a unique ID.  It is named <code>Line Id</code>.   They also have a blank field named <code>Program Justification</code>.  </p>
  
  <p>The <code>.csv</code> file I am importing has only 2 fields <code>Line Id</code> and <code>Program Justification</code>.   They should sync with the existing entries.  But, FeedMe keeps throwing an <strong>error</strong> </p>
  
  <pre><code>*justAPAF Justification: Unable to match an existing element. Have you set a unique identifier for ["lineId"] and does this have a value? - Element.php:104*
  </code></pre>
  
  <p>I do not know what I am doing wrong.  I use <code>Line Id</code> as a unique identifier in multiple database, data parsing and data visualization tools with no issues. </p>
  
  <p>I am sure this is a simple 30 second explanation - but it has stopped me cold in my tracks for 5 days now.</p>
  
  <p>Thanks</p>
  
Tags: <plugin-development><plugins><plugin-feedme>
Title: I just can't get FeedMe to work
ThreadText: # I just can't get FeedMe to work
  
  (Asked by: username_0 on 2018-04-30)
  
  I am trying to use the **FeedMe** plugin to append data to existing entries.
  
  My existing entries have a field that is a unique ID. It is named `Line Id`. They also have a blank field named `Program Justification`.
  
  The `.csv` file I am importing has only 2 fields `Line Id` and `Program Justification`. They should sync with the existing entries. But, FeedMe keeps throwing an **error**
  
  ```
  *justAPAF Justification: Unable to match an existing element. Have you set a unique identifier for ["lineId"] and does this have a value? - Element.php:104*
  
  ```
  
  I do not know what I am doing wrong. I use `Line Id` as a unique identifier in multiple database, data parsing and data visualization tools with no issues.
  
  I am sure this is a simple 30 second explanation - but it has stopped me cold in my tracks for 5 days now.
  
  Thanks
  
  **Tags:** plugin-development, plugins, plugin-feedme
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-05-02. Score: 1
  
  I believe we figured this out over Slack, but the issue here was that you need to actually import your `Line Id` column into your `lineId` field, otherwise Feed Me doesn't know anything about that.
  
  The checkbox to tell Feed Me to use a certain field's value to match existing elements on is one half of the problem - you've already correctly chosen `Line Id`. The issue is you need the other half - what data in your feed is supposed to match up with `Line Id` and `lineId`.
  
  I suppose a less confusing UI would be to have an accompanying dropdown field near those checkboxes to say which bit of data in your feed should you be comparing with.
  
  > **Comments:**
  > **username_0**: Yep - everything is working.  I am closing it now.  Thanks again!  
  
  ---
  
  