Rails where not behaving as expected - ruby-on-rails

Question

I'm trying to retrieve a set of items using where in rails. If I retrieve all I see:
2.2.2 :027 > JourneyLeg.all
JourneyLeg Load (0.2ms) SELECT "journey_legs".* FROM "journey_legs"
=> #<ActiveRecord::Relation [
#<JourneyLeg id: 1, start_station: 24, end_station: 25, departure_time: "2000-01-01 06:37:00", arrival_time: "2000-01-01 06:45:00", journey: 6, created_at: "2015-07-25 11:32:42", updated_at: "2015-07-25 11:32:42">,
#<JourneyLeg id: 2, start_station: 25, end_station: 26, departure_time: "2000-01-01 06:46:00", arrival_time: "2000-01-01 06:50:00", journey: 6, created_at: "2015-07-25 11:32:42", updated_at: "2015-07-25 11:32:42">]>
And now I want to only return items where start_station is 24, so I use JourneyLeg.where(:start_station => 24)
2.2.2 :028 > JourneyLeg.where(:start_station => 24)
JourneyLeg Load (0.1ms) SELECT "journey_legs".* FROM "journey_legs" WHERE "journey_legs"."id" = ? [["start_station", 24]]
=> #<ActiveRecord::Relation []>
But for some reason this is querying id and not start_station (and hence not finding anything) but I have no idea why.
Update 1
Thanks to the comment from David, I spotted that the issue is caused by the fact I have an attribute on the model called start_station which is an integer but also a has_one relationship called start_station
has_one :start_station, :class_name => "Station", :primary_key => "start_station", :foreign_key => "id"
If I remove this relationship or rename it, then the following works as expected with the various suggestions:
JourneyLeg.where(:start_station => 24)
JourneyLeg.where(start_station: 24)

Answer 1

Try this
JourneyLeg.where("start_station = '24'")

Answer 2

This should work based on Documentation of where
JourneyLeg.where({:start_station => 24})
I have tried this with my local application's model called Article, following variant of where works (Rails 4.2.2, Ruby 2.0.0p247)
Variant 1
irb(main):006:0> Article.where({id: 2})
Article Load (1.0ms) SELECT "articles".* FROM "articles" WHERE "articles"."id" = ? [["id", 2]]
=> #<ActiveRecord::Relation [#<Article id: 2, title: "World", text: nil, created_at: "2015-07-25 21:09:16", updated_at: "2015-07-25 21:09:16">]>
Variant 2
irb(main):009:0> Article.where({:id => 2})
Article Load (0.0ms) SELECT "articles".* FROM "articles" WHERE "articles"."id" = ? [["id", 2]]
=> #<ActiveRecord::Relation [#<Article id: 2, title: "World", text: nil, created_at: "2015-07-25 21:09:16", updated_at: "2015-07-25 21:09:16">]>
Variant 3
irb(main):010:0> Article.where(id: 2)
Article Load (0.0ms) SELECT "articles".* FROM "articles" WHERE "articles"."id" = ? [["id", 2]]
=> #<ActiveRecord::Relation [#<Article id: 2, title: "World", text: nil, created_at: "2015-07-25 21:09:16", updated_at: "2015-07-25 21:09:16">]>