Thanks, serialization plugin looks like what I wanted.
I also need to export model value as a hash for further processing, is
there a way to do that, as Model#values is left untouched by serialization?
Perhaps should I write a plugin that would do: Hash[columns.map {|c| [c,
get_column_value(c)]}] ?
Oh, I see that json_serialization, will solve my problem, but I'm still
curious on how to get something like Model#to_h
On Wednesday, 5 May 2021 at 18:57:33 UTC+2 Jeremy Evans wrote:
> On Wed, May 5, 2021 at 8:35 AM Stéphane D'Alu <[email protected]> wrote:
>
>> I've a model for which I would like to have one of its column value
>> automatically converted to a more appropriate object, I'm doing something
>> like that (the User class is not a sequel model)
>>
>> class InventoryItem < Model
>> def user
>> User.new(super)
>> end
>>
>> def user=(v)
>> v.to_s
>> end
>> end
>>
>> That doesn't seem the right way to do it, as every call to
>> InventoryItem#user or InventoryItem#user= will perform the conversion which
>> can be costly.
>>
>> I realized that I can avoid defining #user= by doing
>> class User
>> def sql_literal(ds)
>> ds.literal(self.to_s)
>> end
>> end
>>
>> But I'm still left clueless for InventoryItem#user
>>
>
> I'm guessing the serialization plugin may work for what you want. The
> deserializer would wrap the value in the User instance, and the serializer
> would extract whatever part of the User instance you want stored in the
> database.
>
> The composition plugin could also fulfill the need, but you need to use a
> different method than the database column method for accessing the composed
> value in that case.
>
> However, please understand I don't have a good understanding of what you
> are trying to accomplish, so either of those suggestions may be off base.
>
> Thanks,
> Jeremy
>
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