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POHow to display inputs of for associated object with object is created on new form?
 

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  1. POHow to display inputs of for associated object with object is created on new form?
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    <p>I'm not sure the topic will have the right meaning what I want, but I don't know how to explain. I'm building online examination app. To easy for explain problem, I focus to 6 tables:</p> <ol> <li>Courses: <strong><code>has_many</code></strong> topics</li> <li>Topics: <strong><code>belongs_to</code></strong> course</li> <li>Questions: <strong><code>belongs_to</code></strong> topic, <strong><code>has_many</code></strong> general_exams, <strong>through:</strong> :general_questions</li> <li>GeneralExams: <strong><code>has_many</code></strong> questions, <strong><code>through:</code></strong> general_questions, <strong><code>belongs_to</code></strong> user, <strong><code>belongs_to</code></strong> course, <strong><code>has_many</code></strong> exam</li> <li><p>GeneralQuestions: <strong><code>belongs_to</code></strong> question, <strong><code>belongs_to</code></strong> general_exam</p></li> <li><p>Exam: <strong><code>belongs_to</code></strong> general exam, <strong><code>belongs_to</code></strong> user</p></li> </ol> <p>This is columns in table GeneralExam: </p> <pre><code>name,description,semester,number_question,duration,used, user_id, course_id </code></pre> <p>What I want to do now, is create a general exam, and can specific a number of questions for each topic of course. Example, I have a <strong>course named</strong> "Database" has 3 topics: A,B,C. Now I want to create general exam for <strong>"Database" course</strong>. I want to specific when create general exam:</p> <ul> <li>5 question for topic A</li> <li>6 question for topic B</li> <li>7 question for topic C</li> </ul> <p>These questions I get random from these topic. I have build a form for create general exam, but I don't know how to get topics of course on the form, and make a field for input number question for each topic. So is there some way to list topics on new form of general exam and each topic will have a field to type in number question will be got random for that topic? Or I need to create a new table to store that information?</p>
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    1. USThanh
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    1. COWhat exactly do you plan to do with the input numbers? Are you trying to determine how many question fields to render in the form? Otherwise, if this is for db performance reasons, why not user [counter cache](http://railscasts.com/episodes/23-counter-cache-column)?
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    2. COI want, with input `number` of question for topics, I will get random `number` of questions of those topics for a GE. I also want to statistic then.
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      1. POHow to display inputs of for associated object with object is created on new form?
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    3. COBecause one general exam will be generated exams for students, and I want to statistic number of question of each topic in exams of students.
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