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How do you update records in intermediate tables in CI3?

#1
Tables are Posts and Tags. 
One Post has Many Tags. And One Tag has Many Posts. A so-called 'Many-to-Many' relationship. 
This is solved with a intermediate table (post_tag) with id for post_id and tag_id and a created_at row. 
Now, How do you handle this in CodeIgniter? 
And before you answer. I also wish to learn how to handle updating records in intermediate table. 
As in, I remove a Post or I add a new Tag to a Post. 
Thanks,  Big Grin
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#2
You make INSERT and UPDATE queries to your table(s).
https://codeigniter.com/user_guide/datab...rting-data
https://codeigniter.com/user_guide/datab...ating-data
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#3
I've created an ORM for CI3

GitHub: https://github.com/vmoulin78/concorde
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