Conditional .where on Social Security No

students_controller.rb

runquery = Student.joins(:user)
    runquery = runquery.where(users: {first_name: params[:first_name]}) if params[:first_name].present?
    runquery = runquery.where(users: {last_name: params[:last_name]}) if params[:last_name].present?
    runquery = runquery.where(users: {loginable_id: params[:id]}) if params[:id].present?
    runquery = runquery.where(program: params[:program]) if params[:program].present?
    runquery = runquery.where(users: {social_security_no: '000000000'}) if params[:social_security_no] == 'no_social' # '000000000' || '' || '0'
    runquery = runquery.select('students.*, students.id as sid, users.*')
    @query = runquery