Active Record generating a wrong query - postgresql

Question

I'm trying to do an extremely simple active record query :
#row = Blazer.where(username: 'test').first
PostgreSQL generation :
Blazer.where(username: 'test').to_sql
outputs :
SELECT "blazer".* FROM "blazer" WHERE "username"."value" = 'test'
which causes an error :
ERROR -- : PG::UndefinedTable: ERROR: missing FROM-clause entry for table "username"
I expected the following PostgreSQL result :
SELECT "blazer".* FROM "blazer" WHERE "username" = 'test'
How can I fix this?
I'm using active record with Sinatra and the app runs on Heroku.
My Blazer class is the following :
class Blazer < ActiveRecord::Base
# phone:string username:string location:string
end

Answer 1

Maybe this is not the correct answer, but I was getting the same error.
I was looking for a Venue with a certain name
venue_name = params.require(:season).permit([:venue_name])
venue = Venue.find_by_name(venue_name)
I also tried with
venue = Venue.where(name: venue_name).first
Both failed saying because it was trying this query
SELECT "venues".* FROM "venues" WHERE "name"."venue_name" = 'venue name' LIMIT 1)
When I was trying this in the console everything looked OK. But when I checked what I was looking for was quite obvious
params.require(:season).permit([:venue_name])
Returns a Hash with only venue_name as key, so instead of looking for a key i was looking for a Hash.
I switched to params.require(:season).permit([:venue_name])[:venue_name] and the issue was fixed.