ActiveRecord Extension With Different Tables

[Usman Shahid]

Hi,

Is it possible in rails to write a generic ActiveRecord::Base child class which is bound with a table of our choice on runtime? for example if it has two functions 'foo' and 'bar' then i should be able to provide a table name on runtime e.g. 'table-a' or 'table-b' and execute these functions on it?

Regards,

Usman

[Greg Navis]

Probably doable (hackable) but I think it’d be extremely unidiomatic Rails. If you could tell us what you’re trying to achieve we might be able to suggest a better solution.

Cheers
Greg

[Usman Shahid]

I cannot find an alternative to this. What i'm trying to do is write a generic interface which can answer generic queries like search based on specific column and aggregate queries etc. Underlying table is provided to the Model on initialization and I want it hooked with that table so that I can run these active record generic queries (and some generic extensions) on the underlying table.

Also, how do I hack it? Is there any downside of doing it?

Regards

Greg

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[Colin Law]

On 15 October 2016 at 10:07, Usman Shahid <usman....@gmail.com> wrote:

I cannot find an alternative to this. What i'm trying to do is write a generic interface which can answer generic queries like search based on specific column and aggregate queries etc. Underlying table is provided to the Model on initialization and I want it hooked with that table so that I can run these active record generic queries (and some generic extensions) on the underlying table.

Also, how do I hack it? Is there any downside of doing it?

If you want methods available in a number of models you can derive an intermediary class from ActiveRecord base, provide the methods in there, and derive your models from the intermediary.

Colin

[Greg Navis]

What Colin said. Alternatively, you could write a concern and include it in models you want to support in the search feature.

[Usman Shahid]

Actually these tables and models are dynamically added to the database, every addition requires creating a new model in the system which contains nothing but the table name. I'm trying to avoid that by creating a single model which can handle multiple tables given a table name using ActiveRecord query interface.

On 15 October 2016 at 17:23, Greg Navis <con...@gregnavis.com> wrote:

What Colin said. Alternatively, you could write a concern and include it in models you want to support in the search feature.

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[nanaya]

Hi,

On Sat, Oct 15, 2016, at 22:10, Usman Shahid wrote:
> Actually these tables and models are dynamically added to the database,
> every addition requires creating a new model in the system which contains
> nothing but the table name. I'm trying to avoid that by creating a single
> model which can handle multiple tables given a table name using
> ActiveRecord query interface.
>

You're probably better off using arel[1] directly instead of bending ar
to your need.

[1] https://github.com/rails/arel