Class: ActiveRecord::Associations::Preloader::Association

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/associations/preloader/association.rb

Instance Method Summary collapse

Instance Method Details

#associated_records_by_owner(preloader) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 17

def associated_records_by_owner(preloader)
  # CPK
  owners_map = owners_by_key
  #owner_keys = owners_map.keys.compact
  owner_keys = owners.map do |owner|
    Array(owner_key_name).map do |owner_key|
      owner[owner_key]
    end
  end.compact.uniq

  # Each record may have multiple owners, and vice-versa
  records_by_owner = owners.each_with_object({}) do |owner,h|
    h[owner] = []
  end

  if owner_keys.any?
    # 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  = owner_keys.each_slice(klass.connection.in_clause_length || owner_keys.size)

    records = load_slices sliced
    records.each do |record, owner_key|
      owners_map[owner_key].each do |owner|
        records_by_owner[owner] << record
      end
    end
  end

  records_by_owner
end

#load_slices(slices) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 48

def load_slices(slices)
  @preloaded_records = slices.flat_map { |slice|
    records_for(slice)
  }

  @preloaded_records.map { |record|
    # CPK
    #[record, record[association_key_name]]
    owner_key = Array(association_key_name).map do |key_name|
      record[key_name]
    end.join(CompositePrimaryKeys::ID_SEP)
    [record, owner_key]
  }
end

#owners_by_key ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 63

def owners_by_key
  @owners_by_key ||= owners.group_by do |owner|
    # CPK
    # key = owner[owner_key_name]
    key = Array(owner_key_name).map do |key_name|
      owner[key_name]
    end
    # CPK
    # key && key.to_s
    key && key.join(CompositePrimaryKeys::ID_SEP)
  end
end

#query_scope(ids) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 5

def query_scope(ids)
  # CPK
  # scope.where(association_key.in(ids))

  if reflection.foreign_key.is_a?(Array)
    predicate = cpk_in_predicate(table, reflection.foreign_key, ids)
    scope.where(predicate)
  else
    scope.where(association_key.in(ids))
  end
end