Please take a look at the following snippet:
<class identity="id" key-generator="HIGH-LOW" name="model.Question">
<map-to xml="question" table="question" />
<field name="id" type="integer">
<sql name="id" type="integer" />
</field>
<field name="subject" type="string">
<sql name="subject" type="varchar" />
</field>
<field name="option" type="model.Option" collection="collection">
<sql many-key="question" />
</field>
<field name="answer" type="model.Option">
<sql name="answer" />
</field>
</class>
<class identity="id" key-generator="HIGH-LOW" name="model.Option">
<map-to xml="questionoption" table="questionoption" />
<field name="id" type="integer">
<sql name="id" type="integer" />
</field>
<field name="question" type="model.Question">
<sql name="question" />
</field>
<field name="value" type="string">
<sql name="value" type="varchar" />
</field>
</class>
As what you can see, a Question contains several possible options, one of which is the
correct answer. That is, option and answer in the Question refer to the same type
"model.Option".
Let's say we have a question with 3 options A, B, C.
The first time I call question.setAnswer(A), it is totally fine. But the next time I
call question.setAnswer(B), guess what? Option A is removed from question.option
collection and in the database A.question is set to null.
I tried this stupid code:
Option a = question.getAnswer();
question.setAnswer(b);
a.setQuestion(question);
but it still doesn't work. I don't have idea about how to solve this problem now.
Could you provide me any suggestion for that? Thanks in advance.
Sean-----------------------------------------------------------
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