Module: ROM::Plugins::Relation::SQL::AutoCombine::InstanceInterface Private

Defined in:
lib/rom/plugins/relation/sql/auto_combine.rb

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Instance Method Summary collapse

Instance Method Details

#for_combine(spec) ⇒ SQL::Relation

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Default methods for fetching combined relation

This method is used by default by ‘combine`

Returns:



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# File 'lib/rom/plugins/relation/sql/auto_combine.rb', line 35

def for_combine(spec)
  case spec
  when ROM::SQL::Association
    spec.call(__registry__, self).preload(spec)
  else
    preload(spec)
  end
end

#preload(spec, source) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/plugins/relation/sql/auto_combine.rb', line 45

def preload(spec, source)
  case spec
  when ROM::SQL::Association::ManyToOne
    pk = source.source[source.source.primary_key].qualified

    where(pk => source.pluck(pk.name))
  when Hash, ROM::SQL::Association
    source_key, target_key = spec.is_a?(Hash) ? spec.flatten(1) : spec.join_keys(__registry__).flatten(1)

    target_pks = source.pluck(source_key.to_sym)
    target_pks.uniq!

    where(target_key => target_pks)
  end
end