[Rails] newbie trying to understand include

I have two models, users and companies as indicated below. The users
table has a foreign_key "company_id".

class User < ActiveRecord::Base
has_many :companies
end

class Company < ActiveRecord::Base
belongs_to: user
end

In my controller:

@user = User.where(:id => params[:id]).includes(:companies)

I get the following error:
SQlite3::SQLException: no such column: companies.user_id: SELECT
"companies".* FROM "companies" WHERE "companies"."user_id" IN ('8')

Why is RAILS getting the foreign key wrong and why is it trying to
pull columns in the users table into the companies model?

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