Module: Gitlab::Database::DateTime

Defined in:
lib/gitlab/database/date_time.rb

Instance Method Summary collapse

Instance Method Details

#subtract_datetimes(query_so_far, start_time_attrs, end_time_attrs, as) ⇒ Object

Find the first of the ‘end_time_attrs` that isn’t ‘NULL`. Subtract from it the first of the `start_time_attrs` that isn’t NULL. ‘SELECT` the resulting interval along with an alias specified by the `as` parameter.

Note: the interval is returned as an INTERVAL type.



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# File 'lib/gitlab/database/date_time.rb', line 11

def subtract_datetimes(query_so_far, start_time_attrs, end_time_attrs, as)
  diff_fn = subtract_datetimes_diff(query_so_far, start_time_attrs, end_time_attrs)

  query_so_far.project(diff_fn.as(as))
end

#subtract_datetimes_diff(query_so_far, start_time_attrs, end_time_attrs) ⇒ Object 



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# File 'lib/gitlab/database/date_time.rb', line 17

def subtract_datetimes_diff(query_so_far, start_time_attrs, end_time_attrs)
  Arel::Nodes::Subtraction.new(
    Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs)),
    Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs))
  )
end