Rails 3, prepared query not working with nil value - sql

Question

Here is my query
query = "(description = ? AND address1 = ?) AND (city = (?) OR old_city = (?) OR cb_city = (?))"
Input data :
office_data = {"description"=>"Europe HQ", "city"=>"Dublin", "street_1"=>nil}
But When I queries as
office = company.offices.where(query, office_data["description"], office_data["street_1"], office_data["city"], office_data["city"], office_data["city"]).first
Equivalent SQL:
SELECT "offices".* FROM "offices" WHERE "offices"."company_id" = 6 AND ((description = 'Europe HQ' AND address1 = NULL) AND (city = ('Dublin') OR old_city = ('Dublin') OR cb_city = ('Dublin'))) LIMIT 1
Getting result as
nil
Though I am records in company.offices
As
[#<Office id: 393, company_id: 6, description: "Europe HQ", address1: nil, address2: nil, zip_code: nil, city: nil, state_code: nil, country_code: nil, latitude: nil, longitude: nil, created_at: "2014-08-19 15:13:58", updated_at: "2014-08-19 15:13:58", cb_city: "Dublin", cb_state_code: nil, cb_country_code: "IRL", old_city: nil, region_code: nil, is_hq: nil, cb_region: "Dublin", cb_updated: "2014-04-20 10:53:24", city_uuid: "97c70aa17568ca5375122f181f0484a7", city_path: "location/dublin/97c70aa17568ca5375122f181f0484a7">, #<Office id: 389, company_id: 6, description: "Europe HQ", address1: nil, address2: nil, zip_code: nil, city: nil, state_code: nil, country_code: nil, latitude: nil, longitude: nil, created_at: "2014-08-19 15:02:44", updated_at: "2014-08-19 15:02:44", cb_city: "Dublin", cb_state_code: nil, cb_country_code: "IRL", old_city: nil, region_code: nil, is_hq: nil, cb_region: "Dublin", cb_updated: "2014-04-20 10:53:24", city_uuid: "97c70aa17568ca5375122f181f0484a7", city_path: "location/dublin/97c70aa17568ca5375122f181f0484a7">]
Don't What's wrong with query? Anyone knows what's wrong?

Answer 1

As pointed out by #Mischa and #Victor, the problem is indeed "NULL =". To solve the problem change the "query" parameter as below:
query = "(description = ? AND (address1 = ? OR address1 is NULL)) AND (city = (?) OR old_city = (?) OR cb_city = (?))"
No change is required to "office_data" parameter or your query.
Similarly, you may also need to make a change for city and other parameters too. As these can also have a NULL value

Answer 2

The problem is comparing address with NULL using the = sign - every operation besides IS against NULL is false. Because of that you end up with (true AND false) and (...), resulting in false.
Note that the second query you added in the comments contains no address = NULL - that's why it works in that case.