How to find the ids used by current user - ruby-on-rails

Question

I have created a quiz and i displayed the items in one per page.. i want the values of question id that is visited by the current user . in this code i give next and it render the question i want the visited question id by current user
def next
#user = current_user
#student = Student.find_by_admission_no(#user.username)
#exam_group = ExamGroup.find_by_id(params[:exam_group_id])
#answer = Answer.new(params[:ans])
#answer.answer = params[:answer]
#answer.exam_group_id = #exam_group.id
#answer.user_id = #user.id
passed_question = params[:passed_question]
#answer.questions_id = passed_question
next_question = params[:next_question]
#question = Question.find_by_id(passed_question)
#module = Question.find_by_sql ["SELECT student_additional_field_id FROM questions WHERE id=#{passed_question}"]
student_additional_field_id = #module[0].student_additional_field_id
#questions = Question.find(:all, :conditions => [' exam_group_id=? && student_additional_field_id=? ',#exam_group,student_additional_field_id], :offset => #ans)
#ques = []
#questions.shuffle.each do |a|
#ques.push a.id unless a.id.nil?
end
a = #ques[0]
session[:ques_id] = a
#answer.modules_id = student_additional_field_id
if params[:answer] == #question.is_answer
#answer.marks = 1
else
#answer.marks = 0
end
if #answer.save
#ans = Question.find_by_id(a, :conditions => [' id not in (?) && exam_group_id=?',answered, #exam_group])
unless #ans.nil?
render(:update) do |page|
page.replace_html 'main', :partial => 'ans', :object => #ans
end
else
render(:update) do |page|
page.replace_html 'main', :partial => 'ans2'
end
end
end
end

Answer 1

It seems your problem is to do with Rails model associations:
Why do we need associations between models? Because they make common
operations simpler and easier in your code. For example, consider a
simple Rails application that includes a model for customers and a
model for orders. Each customer can have many orders
ActiveRecord Associations
ActiveRecord associations allow you to define a primary_key (typically an ID), which you can then reference on other tables through a foreign_key. The foreign key is typically a table column which will be called something like user_id, or another type of ID
You can associate your models using these functions:
belongs_to
has_one
has_many
has_many :through
has_one :through
has_and_belongs_to_many
To answer your question, you're obviously getting the current_user ID okay - so if you managed to get the relations set up correctly, you could literally call the data in this way:
#user = User.find(current_user.id)
#exam_group = #user.exams_groups
I would go through your code & put more info into it.... but I think you need to learn about ActiveRecord associations first