Bit of a weird situation here.
So I have a dataset that I want to be able to pass around everywhere
treated normally, except that I have a `WHERE
` and `GROUP BY` I want to always apply to it before any rows are returned.
I can't just do `ds.group(:a, :b)` and pass that around, because any
conditions or joins that would be called on it in the meantime would be
applied in the wrong order.
So I basically want something similar to how `row_proc` works, except it's
more of a `dataset_proc`.
It seems to me like the most straightforward way to accomplish this would
be modifying `each`:
module Sequel
class Dataset
def with_dataset_proc(ds_proc)
@opts[:dataset_proc] = ds_proc
end
alias_method :each, :_each
def each
@opts[:dataset_proc].call(self)._each
end
end
end
ds = ds.with_dataset_proc(Proc.new(|ds| ds.where(:x => 1).group(:a, :b))
Not sure if that's valid code above, but hopefully gets the idea across.
Is this a good way to go about it, or is there perhaps a more elegant
solution, or something already existing that does the same thing?
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