How can I add to one table while I'm adding to another

Here is the scenario based on a simple blog:

The model for the blog is called Post. Post has the following fields:
id, title, body, created, modified. There are two other related
models: Tag and Comment. Tag has the following fields: id, name,
created, modified. Comment has the following fields: id, name, email,
body, blog_id, created, modified.

These are the associations: Post hasMany Comment, Post
hasAndBelongsToMany Tag, Tag hasAndBelongsToMany Post, Comment
belongsTo Post.

Therefore another table is required to keep track of the associations
between Post and Tag. The posts_tags table has the following fields:
post_id, tag_id.

So let's say I want to write a new blog Post. And let's say I want to
add some new tags that already are not in the table. How do I do that?
How do I add to two tables at the same time?

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