Module: Switchman::ActiveRecord::Preloader::Association
- Defined in:
- lib/switchman/active_record/association.rb
Class Method Summary collapse
Instance Method Summary collapse
- #associated_records_by_owner(preloader = nil) ⇒ Object
- #owners_by_key ⇒ Object
- #scope ⇒ Object (also: #scoped)
Class Method Details
.included(klass) ⇒ Object
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# File 'lib/switchman/active_record/association.rb', line 96 def self.included(klass) klass.send(:remove_method, :associated_records_by_owner) klass.send(:remove_method, :owners_by_key) if ::Rails.version < '4' klass.send(:remove_method, :scoped) else klass.send(:remove_method, :scope) end end |
Instance Method Details
#associated_records_by_owner(preloader = nil) ⇒ Object
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# File 'lib/switchman/active_record/association.rb', line 106 def associated_records_by_owner(preloader = nil) owners_map = owners_by_key if klass.nil? || owners_map.empty? records = [] else # determine the shard to search for each owner if reflection.macro == :belongs_to # for belongs_to, it's the shard of the foreign_key partition_proc = ->(owner) do if owner.class.sharded_column?(owner_key_name) Shard.shard_for(owner, owner[owner_key_name]) else Shard.current end end elsif !reflection.[:multishard] # for non-multishard associations, it's *just* the owner's shard partition_proc = ->(owner) { owner.shard } else # for multishard associations, it's the owner object itself # (all associated shards) # this is the default behavior of partition_by_shard, so just set it to nil # to avoid the proc call # partition_proc = ->(owner) { owner } partitition_proc = nil end records = Shard.partition_by_shard(owners, partition_proc) do |partitioned_owners| # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000) # Make several smaller queries if necessary or make one query if the adapter supports it sliced_owners = partitioned_owners.each_slice(model.connection.in_clause_length || partitioned_owners.size) sliced_owners.map do |slice| relative_owner_keys = slice.map do |owner| key = owner[owner_key_name] if key && owner.class.sharded_column?(owner_key_name) key = Shard.relative_id_for(key, owner.shard, Shard.current(owner.class.shard_category)) end key && key.to_s end relative_owner_keys.compact! records_for(relative_owner_keys) end end records.flatten! end # Each record may have multiple owners, and vice-versa records_by_owner = owners.each_with_object({}) do |owner,h| h[owner] = [] end records.each do |record| owner_key = record[association_key_name] owner_key = Shard.global_id_for(owner_key, record.shard) if owner_key && record.class.sharded_column?(association_key_name) owners_map[owner_key.to_s].each do |owner| records_by_owner[owner] << record end end records_by_owner end |
#owners_by_key ⇒ Object
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# File 'lib/switchman/active_record/association.rb', line 169 def owners_by_key @owners_by_key ||= owners.group_by do |owner| key = owner[owner_key_name] key = Shard.global_id_for(key, owner.shard) if key && owner.class.sharded_column?(owner_key_name) key && key.to_s end end |
#scope ⇒ Object Also known as: scoped
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# File 'lib/switchman/active_record/association.rb', line 177 def scope build_scope end |