Class: ActiveRecord::Associations::JoinDependency

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

Defined Under Namespace

Classes: Aliases

Instance Method Summary collapse

Instance Method Details

#construct(ar_parent, parent, row, seen, model_cache, strict_loading_value) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/join_dependency.rb', line 73

def construct(ar_parent, parent, row, seen, model_cache, strict_loading_value)
  return if ar_parent.nil?

  parent.children.each do |node|
    if node.reflection.collection?
      other = ar_parent.association(node.reflection.name)
      other.loaded!
    elsif ar_parent.association_cached?(node.reflection.name)
      model = ar_parent.association(node.reflection.name).target
      construct(model, node, row, seen, model_cache, strict_loading_value)
      next
    end

    key = aliases.column_alias(node, node.primary_key)
    # CPK
    if key.is_a?(Array)
      id = Array(key).map do |column_alias|
        row[column_alias]
      end
      # At least the first value in the key has to be set.  Should we require all values to be set?
      id = nil if id.first.nil?
    else # original
      id = row[key]
    end

    if id.nil?
      nil_association = ar_parent.association(node.reflection.name)
      nil_association.loaded!
      next
    end

    model = seen[ar_parent][node][id]

    if model
      construct(model, node, row, seen, model_cache, strict_loading_value)
    else
      model = construct_model(ar_parent, node, row, model_cache, id, strict_loading_value)

      seen[ar_parent][node][id] = model
      construct(model, node, row, seen, model_cache, strict_loading_value)
    end
  end
end

#instantiate(result_set, strict_loading_value, &block) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/join_dependency.rb', line 18

def instantiate(result_set, strict_loading_value, &block)
  primary_key = aliases.column_alias(join_root, join_root.primary_key)

  seen = Hash.new { |i, parent|
    i[parent] = Hash.new { |j, child_class|
      j[child_class] = {}
    }
  }.compare_by_identity

  model_cache = Hash.new { |h, klass| h[klass] = {} }
  parents = model_cache[join_root]

  column_aliases = aliases.column_aliases(join_root)
  column_names = []

  result_set.columns.each do |name|
    column_names << name unless /\At\d+_r\d+\z/.match?(name)
  end

  if column_names.empty?
    column_types = {}
  else
    column_types = result_set.column_types
    unless column_types.empty?
      attribute_types = join_root.attribute_types
      column_types = column_types.slice(*column_names).delete_if { |k, _| attribute_types.key?(k) }
    end
    column_aliases += column_names.map! { |name| Aliases::Column.new(name, name) }
  end

  message_bus = ActiveSupport::Notifications.instrumenter

  payload = {
    record_count: result_set.length,
    class_name: join_root.base_klass.name
  }

  message_bus.instrument("instantiation.active_record", payload) do
    result_set.each { |row_hash|
      # CPK
      # parent_key = primary_key ? row_hash[primary_key] : row_hash
      parent_key = if primary_key.kind_of?(Array)
                     primary_key.map {|key| row_hash[key]}
                   else
                     primary_key ? row_hash[primary_key] : row_hash
                   end

      parent = parents[parent_key] ||= join_root.instantiate(row_hash, column_aliases, column_types, &block)
      construct(parent, join_root, row_hash, seen, model_cache, strict_loading_value)
    }
  end

  parents.values
end