Ruby on Rails

On May 4, 2015, at 6:23 AM, Colin Law <clanlaw@gmail.com> wrote:

> On 4 May 2015 at 10:31, Hemant Bhargava <lists@ruby-forum.com> wrote:
>> Hi,
>>
>> Not being an expert in RoR, I have a logical query. It is not a
>> programming question.
>>
>>
>> Situation is :
>>
>> I have a Book model and status of the book can be anything from NEW,
>> OLD, VERY_OLD. It can be NEW, OLD both or it could be OLD and VERY_OLD
>> both. What would you suggest to implement in such a case? I wanted to
>> save user choice in database.
>>
>> I can create new model for Book condition but I feel that there must be
>> some other nice way to handle it. Is there?
>
> Is there any other information associated with the status? If not
> there is no point having another model. Just have boolean fields for
> each status and set them as appropriate. Or if there is a specific
> set of valid combinations (old, very old, old+very old etc) then you
> could use an enum field with a value for each combination.

Does a "Book" have many "Copies"? Are you looking to enter a Book once (as in Winnie-the-Pooh, Milne, A.A.) and then have a Copy in paperback, slightly foxed cover, sun-faded page edges, 6 out of 10?

I could definitely see an argument for not re-typing all of the bibliographic detail since it will be identical for different copies of the same book.

Walter

>
> Colin
>
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