为什么.where（：attribute => nil）检查nil值？

Question

So here is the query, very simple:

field = :has_bill
value = nil
scoped.where(field => value)

And it outputs as:

(`electricity_profile_segment_summaries`.`has_swimming_pool` IN ('') OR `electricity_profile_segment_summaries`.`has_swimming_pool` IS NULL)

Which includes nil values and 0 values as well. Which is not correct, I would like to represent only NULL values from the table.

Any help appreciated

Answer 1

How about manually limiting to NULL for the nil case?

if value.nil?
  scoped.where( "#{field} IS NULL" )
else
  scoped.where( field => value
end