mmd-osm left a comment (openstreetmap/openstreetmap-website#6326)
I'm a bit lost how the normalisation is supposed to work - without changing
anything on the db schema. I tried to use `has_many :element_tags, :as =>
:relation_tags`, but PostgreSQL was complaining about some unknown
columns/types.
In the meantime, the previous code is now a bit more generic, and derives
associations from class names. I think that's not too bad.
```ruby
def prefetch_member_tags(feature)
members = feature.relation_members.filter_map(&:member)
members.group_by(&:class).each do |klass, records|
association = :"#{klass.name.downcase}_tags"
ActiveRecord::Associations::Preloader.new(
:records => records,
:associations => association
).call
end
end
```
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