rails joins and merge method in heroku postgres -


i having issue joins , merge method when app deployed heroku.

def self.get_gift_by_gender_age(c)  result = self.where(:gender => [c.gender, "unisex"]).joins(:age_classifications).merge(ageclassification.by_age_range(c)) end

this works fine in mysql returns no results in postgres. doesn't give me error don't know how trouble shoot it.

edit:

below query generated:

select "products".* "products" inner join "age_classifications" on "age_classifications"."product_id" = "products"."id" "products"."gender" in ('female', 'unisex') , "age_classifications"."age_range_id" = 1


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