Duplicate values on multivalue fields when updating

This happens on text fields too, and possibly others. Attaching a patch that addresses this for both termreference and text fields.

This is per-design. If it's in the feed, it's in the field. There could be an argument for doing this for term reference fields, but definitely not text fields. You can use something like Feeds Tamper to filter the list before it gets into the mapper.

@twistor, could you reconsider this? The issue is not that multiple duplicate values that are present in the source feed get imported. Let me describe the issue a little better...

Say you have a content type with a title, a unique ID field (for updates) and a multi value text field called Cities. Have a csv file with title in one column and cities in another column, pipe delimited. Using feeds tamper, you split out those cities. When you import the first time, everything looks right. You have one of each value that was in the source csv. You have the importer set to update content when reimporting. So I update the title in the csv and reimport. The title is updated, but now I have two of each city that is in my source feed, even though I didn't change or add any. If you update the title 5 times this way, you'll have 5 duplicates of every city. That's what the attached patch addresses.

Can you try the recent dev release? This should already be fixed.

@twistor I just just tested the latest dev release and this issue does seem to be fixed there. Thanks!