Ruby on Rails

Tables:

Blogs (id, name)
Users (id, name)
Pages (id, title, data)
Visits (id, user_id, blog_id, page_id)

How many views every blog have?
Result should be:: blog_id, blog_name, visits_count

How many times each page has been accessed?
Result should be: page_id, page_title, page_data, visits_count

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