CSV export with different class values - ruby-on-rails

Question

In my to_csv function I am wanting to print the name of a particular course, then print under that the name of a module in that course and then each task of that module.
e.g. (multiple headers to allow for easy csv import of same file)
Course_name #header
Course1 #course name
Module_name #header
Module1 #module name
Tasks #header
Task1 #task name
Taskdescription #description of task
Taskresult #expected result of task
Task2 #task name
Taskdescription #description of task
Taskresult #expected result of task
Module2 #module name
Tasks #header
Task1 #task name
Taskdescription #description of task
Taskresult #expected result of task
In my course model I have:(comments are only in stackoverflow, not in actual code)
def to_csv(params)
CSV.generate do |csv|
csv << %w{ Course_name }
csv << [ self.name ]
csv << %w{ Module_name }
Mod.all.each do |mod| #load all mods
if mod.course_id == self.id do #match mod to their course and only print those if they match
csv << [ mod.name ]
Task.all.each do |task| #load all tasks
if task.mod_id == mod.id do #match task to their module and only print those if they match
csv << [ task.name]
csv << [ task.description ]
csv << [ task.expectedresult ]
end
end
end
end
end
When I download the CSV file, i only get:
Course_name
course1
Module_name
so the the program is being caught at if mod.course_id == self.id do
not Mod.all.each do |mod| because when I only had that line in it printed every module.
Am I using the right logic check for model or am I missing something else.
Any help on this would be appreciated, thanks.
EDIT:
I tried using
Mod.all.each do |mod|
if 1 == 1 do
csv << [ mod.name ]
which printed each module name, so the if function works.
Doing:
Mod.all.each do |mod|
csv << [ mod.name ]
csv << [ mod.id ]
csv << [ self.id ]
results in
module1 #mod name
1 #mod id
1 #course id
module2 #mod name
2 #mod id
1 #course id
If I use .to_i for both mod.id and self.id that would set both to int 1, for module 1, which should allow the if function to pass. but it does not.

Answer 1

I think you should remove do from the if blocks (it's a valid syntax in Elixir, not in Ruby)
if mod.course_id == self.id