Custom dataset methods force duplicate code.
Example of desired code:
Sequel::Model.plugin :dataset_associations
class Area < Sequel::Model
# has PostgreSQL `polygon`
many_to_one :album
one_to_many :included_locations, class: 'Location' do |ds|
ds
.join(
Sequel[:areas].as(:joined_areas),
Sequel.lit('locations.point <@ joined_areas.polygon')
)
.where(
Sequel[:joined_areas][:id] =>
defined?(id) ? id : Sequel[:areas][:id]
)
end
end
class Album < Sequel::Model
# has `selling_areas` with PostgreSQL `polygon`
one_to_many :selling_areas, class: Area
one_to_many :potential_listeners, class: 'Listener' do |ds|
selling_areas.included_locations.listeners
end
end
class Location < Sequel::Model
# has PostgreSQL `point`
one_to_many :listeners
one_to_many :reaching_areas, class: Area do |ds|
ds
.join(
Sequel[:locations].as(:joined_locations),
Sequel[:joined_locations][:id] =>
defined?(id) ? id : Sequel[:locations][:id]
)
.where(Sequel.lit('"polygon" @> locations.point') )
end
end
class Listener < Sequel::Model
# has `locaiton` with PostgreSQL `point`
many_to_one :locaiton
one_to_many :available_albums, class: Album do |ds|
location.reaching_areas.albums
end
end
In some cases I need for `available_albums` for `Listener` instance, in
other for dataset (for counts in list), and I need for
`potential_listeners` of `Album` instance too :(
On Tuesday, December 19, 2017 at 6:52:14 PM UTC+3, Jeremy Evans wrote:
>
> On Tuesday, December 19, 2017 at 7:05:44 AM UTC-8, Alexander Popov wrote:
>>
>> But `:dataset` option doesn't work with
>> `Sequel::Plugins::DatasetAssociations`… Okay, maybe I should use regular
>> dataset methods instead of associations.
>>
>
> I don't think dataset_associations can support custom associations. You'd
> have to add your own dataset method manually for custom dataset
> associations.
>
> Thanks,
> Jeremy
>
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