Ruby on Rails

For suppose I have three database table eg:
recruiters
------------------------------------
recruiter_id | name | email |
------------------------------------
1 | xyz | x@gmail.com |
------------------------------------

companies
------------------------------------
company_id | recruiter_id | c_name |
------------------------------------
1 | 1 | abc |
------------------------------------

posts
------------------------------------
post_id | company_id | post_title |
------------------------------------
1 | 1 | etc |
------------------------------------

This is my database.

Now I need at first I signup then create 1 or 2 or 3 companies into one
recruiter_id then create post into company_id.

Database already created but How can I relation this model.

Thanks

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