I restart the server after bundlen install
My environment
ruby 2.1.5, rails 4.0.13, ransack 1.6.3
results with the console
User.first
=> #<User id: 1, email: "email@mail.com">
User.ransack({"email"=>"email@mail.com"}).result.to_sql
=> "SELECT \"users\".* FROM \"users\""
User.search({"email"=>"email@mail.com"}).result.to_sql
=> "SELECT \"users\".* FROM \"users\""
User.where({"email"=>"email@mail.com"}).to_sql
=> "SELECT \"users\".* FROM \"users\" WHERE \"users\".\"email\" = 'email@mail.com'"
You did it wrongly. Your Ransack query should be :
User.ransack(email_eq: "email@mail.com").result
Read the eq (equals) documentation.