Transferring tagged images from another plugin?

I downloaded and activated “WP Media Tagger version 4.0.4”, by phd38. As you observed, this plugin creates a database table “mediatagger” and stores the “object_id” and “term_taxonomy_id” for each assignment you make with the plugin’s “MediaTagger – Explorer” and “MediaTagger – Editor” screens.

You can use the “MLA Custom Field and IPTC/EXIF Mapping Actions and Filters (Hooks)” (see the Settings/Media Library Assistant Documentation tab for more information) to give you a place to add some code for moving the assignments from the MediaTagger table to “real” WordPress taxonomy terms. Here’s an outline of the process:

1. Define a Custom Field mapping rule called something like “Media Tagger”. This doesn’t have to actually map any data; it gives you a way of triggering your code to do the database conversion.
2. Copy and activate the “mla-mapping-hooks-example.php” plugin as described in the Documentation.
3. Add your code to the “mla_mapping_rule” filter, which is a convenient place to do your work. It’s called for every rule, even rules with Data Source “none”.
4. Use the “Map Custom Field Metadata” links on the Media/Edit Media screen or in the Media/Assistant submenu Bulk Edit area to test your work on one or more items. Adjust your code as necessary.
5. When you’re satisfied that the rule is working, use the “Map All Attachments” buttons on the Settings/Media Library Assistant Custom Fields tab to run you code for all of the items in the Media Library.
6. When you’re done, deactivate the “mla-mapping-hooks-example.php” plugin and delete your Custom Field mapping rule.

I can give you more details on any step of the process if you need it, and answer any questions.

The database work is straightforward:

1. Select the term_taxonomy_id from the mediatagger table for the post_ID (passed to the MLA filter).
2. Select the term_id and taxonomy from the term_taxonomy table for the term_taxonomy_id.
3. Use wp_set_object_terms() to assign the taxonomy and term_id value(s) to the post_ID. You can either replace any existing terms or append the new terms.
4. Optionally, remove the object_id and term assignments from the MediaTagger table.

You can also add logic to assign the terms in a different taxonomy, e.g., assign the new terms in “Att. Tags” even though you were using the WordPress Tags taxonomy before.

I can give you more detailed instructions and some sample code if that’s helpful. Let me know:

1. Do you want to replace any terms in the destination taxonomy, or just add to the terms already there?
2. Which taxonomy do you want to assign the new terms in?
3. Do you want to delete the terms from the MediaTagger table after they are assigned to the destination taxonomy?

Thanks for your interest in the plugin and for this interesting question. I will leave the topic unresolved until I hear back from you.

Thanks for your help.

I’m stuck at 3. Add your code to the “mla_mapping_rule” filter, which is a convenient place to do your work. It’s called for every rule, even rules with Data Source “none”.

What code and where do I find the mla_mapping_rule filter? I’ve installed the plugin mla-mapping-hooks-example.php and activated it, although I’m not sure where to view the error log for that. And I’m not sure what code I’m suppose to use or where to put it.

I’m thinking this may be way over my head, maybe I should just start all over with tagging images. Especially when I see the database work, although it looks easy when I go to look at the database, it’s like looking at Japanese, I don’t understand most of it.

Thanks for this update and for your perseverance.

As I said, the code isn’t too hard but you have to understand PHP to work through it.

If you can give me the answers to the three questions at the end of my post I can send you a working copy of the mla-mapping-hooks-example.php plugin. Please send me a note with your e-mail address and I will give you a copy by return e-mail. You can use the Contact Us page at our web site:

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Thanks for your interest, your understanding and your patience.

Thanks, I emailed you with my email and answered the questions in the email. Appreciate your help.

Thank you for getting in touch and for working with me to get the last parts of the solution in place. I am happy to hear it worked well and gave you a way to translate the MediaTagger data into Tag taxonomy assignments.

I have posted the custom plugin we worked out to /media-library-assistant/examples/mla-media-tagger-example.php.txt and released it with MLA version 1.80. I hope other users will find it useful as well.

I am marking this issue resolved, but please update it or get in touch if you have any problems or further questions on this topic.

Thanks for working with me and for your interest in the plugin.