On Friday, August 9, 2013 7:56:06 AM UTC-7, Keith Moore wrote:
>
> I am trying to do something similar to what the Sequel::Model does in
> terms of chaining dataset methods. However, I am having some issues in
> doing this. This may be more of a Ruby design question than a Sequel Gem
> question,
>
> However, I am hoping someone can help me with this issue. Here is what I
> am trying to do:
>
> Item < Sequel::Model(:ITEM)
>
> def self.apply_filter(params)
> c = self.clone
> # loop
> c.dataset = c.dataset.where(some criteria here)
> # end loop
> c
> end
>
> end
>
>
> And in my "controller", I want to be able to do something like the below
> where the other apply methods are chained together in a similar fashion.
>
> items =
> Item.apply_filter(params).apply_pagination(params).apply_order_by(params).all
>
> The problem is that I don't get back instances of type Item. They are of
> type Class.
>
> Can someone tell me how I should go about achieving this?
>
Why do you want to clone the class? If you want instances of type Item,
you shouldn't be cloning the Item class. You probably just want to make
apply_filter a dataset method:
class Item < Sequel::Model(:ITEM)
dataset_module do
def apply_filter(params)
where(some criteria here)
end
end
end
Note that this should work with the example code you provided.
Thanks,
Jeremy
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