Ruby on Rails

On 4 May 2015 at 12:31, Walter Lee Davis <waltd@wdstudio.com> wrote:
>
> 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?

Ah, that would make sense, I was having difficulty understanding how
the same book could have multiple statuses.

Colin

>
> 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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