How to show only the count when querying .group().count in Rails?

Question

Ruby on Rails

Subscriber.all.count => 7
Subscriber.group(:id).count => {12=>1, 13=>1}
Why does group give me a hash, not an absolute number ???
How to decide?

Answer 1

And so?

Subscriber.count(:all, :group => 'id')

Answer 2

What does it mean to decide? In the code , the
absolute quantity is returned, and in the code
, Grouped by the id field.
What other result would you like to see?

Answer 3

Subscriber.group(:id).count => {12=>1, 13=>1}

There is no point in this. Their id seems to be unique.
Then, that group exists for this, to group records by one field, aggregating others.

Answer 4

I looked at the answer about count with parameters and it became interesting that I don’t know about count. It turned out (in 4 rails) that
a rather meaningless expression and is equivalent to Subscriber.count. To be convinced of this, it is enough to read the raw , by the way, in 5 rails, the second parameter from count has already been cut out ...

Answer 5

Subscriber.pluck(:id)