has many through & associate records

[jayoshi13]

The app I'm building performs Assessments through a series of Tests
(about 120 tests in total), the results are stored in the join table
Findings.

Below is the has_many throughout association I am using -

class Test
has_many :findings
has_many :assessments, :through => :findings

class Finding
belongs_to :assessment
belongs_to :test

class Assessment
has_many :findings
has_many :tests, :through => :findings

The data in the Test table is primarily static. When I Create a new
Assessment I want to be able populate the Findings table with all
tests in the Test table, as all tests are mandatory as part of the
assessment.

I can get this to partially work, for example -

a = Assessment.create!(:name => 'assessment1', :test_ids => ['1', '2',
'3'])

mysql>select * from FINDINGS;
+----+---------------+----------------------+-------+----------
+---------+
| id | test_id | assessment_id | pass | fail | verdict
|
+----+---------------+----------------------+-------+----------
+---------+
| 1 | 1 | 1 | NULL | NULL |
NULL |
| 2 | 2 | 1 | NULL | NULL |
NULL |
| 3 | 3 | 1 | NULL | NULL |
NULL |

But I cannot figure out how to supply all Test id's to create the full
set of tests in the Findings table

Any help much appreciated!

Thanks

[Piyush with Rails]

Hi Jayoshi,

But I cannot figure out how to supply all Test id's to
create the full
set of tests in the Findings table

Can you please specify what you need to populate in finding table. as
you have mentioned that you need to specify test ids in finding table
that is already get achieved with the way you followed to populate
findings table.

Please provide details.

Thanks,
Piyush

[Conrad Taylor]

First, I would recommend not using "Test" because it happens to be

module name used by the Ruby Test::Unit.  Thus, let's use class Quiz

for the below explanation.  Next, you should be able to do the following:

1)  create a quiz

quiz = Quiz.create!

2)  create an assessment

assessment = Assessment.create!

3) create a finding

finding = Finding.create!

4)  associate a quiz and assessment to a finding

finding.quiz = quiz

finding.assessment = assessment

finding.save

5)  check the quiz side of the association

quiz.findings

quiz.assessments

6)  check the assessment side of the association

assessment.findings

assessment.quizzes

7)  check the join model of the association

finding.quiz

finding.assessment

8)  check the findings table

Finding.all

Next, in the above, one needed to create both ends of the association (i.e. assessment and quiz) for

the above process to work.  Next, if you are wanting to associate one or more quizzes to an

assessment, you can do one of the following:

assessment.quizzes << quiz1   # associates a single quiz to this assessment

or

Quiz.all.each { |item| assessment.quizzes << item }   # associates all the quizzes to this assessment

or

assessment.quizzes.create!  # create a quiz and associate it to this assessment

Lastly, I would recommend referencing "Agile Web Development with Rails 3ed" by Dave Thomas et al

because it covers this information in greater detail.

Good luck,

-Conrad

quiz.findings << finding

 

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[Jayoshi]

Thanks for the detailed response Conrad, it help me out greatly!

Regards,

Jayoshi