ActiveModel::Attributes (array: true) - should it require Postgres?

[Patrick Davey]

Hi,

I'm really enjoying using the new ActiveModel::Attributes API for making form objects (replacing Virtus).

At the moment, if you want to do :

class Foo
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :bars, :string, array: true

you _must_ be using the `postgresql` adapter and further, it _seems_ you can only do this on a "real" schema backed model (i.e. the above won't work, even if you were using postgres)

I'm wondering if this is likely to change (i.e. if there'll be a feature for non-database backed models that you'll be able to use these "ActiveRecord::Type modifiers" on ActiveModels as well. Seems to me that it should be possible to make it so that it's not coupled to a particular database schema. That said, I find this all quite tricky stuff so I'm almost certainly missing something ;)

Thanks,

Patrick

[San Ji]

ActiveModel is agnostic to the database, you can use it without using any database, so no, it should not require Postgres.

I believe

array: true

on an ActiveRecord model, with MySQL, or SQLite, is possible too.

Just combine it with "serialize"

https://apidock.com/rails/ActiveRecord/Base/serialize/class

[San Ji]

Sorry wrong reference

You should look at

https://apidock.com/rails/ActiveRecord/AttributeMethods/Serialization/ClassMethods/serialize

instead.

[Patrick Davey]

Thanks for the reply San Ji :)

ActiveModel is database agnostic, however, the `attribute :foo, :my_custom_type, array: true` syntax [from the new activerecord::attributes api](https://api.rubyonrails.org/classes/ActiveRecord/Attributes/ClassMethods.html) is only available to postgres, [as it's defined on the postgres adapter](https://api.rubyonrails.org/classes/ActiveRecord/Attributes/ClassMethods.html#method-i-attribute-label-Options)

Possibly my question should be put to the core-team mailing list, as, really I'm wondering about whether the feature should be built in.

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