Class: ActiveRecord::Associations::JoinDependency

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

Defined Under Namespace

Classes: JoinAssociation, JoinPart

Instance Method Summary collapse

Instance Method Details

#instantiate(result_set, aliases) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/join_dependency.rb', line 4

def instantiate(result_set, aliases)
  primary_key = aliases.column_alias(join_root, join_root.primary_key)
  type_caster = result_set.column_type primary_key

  seen = Hash.new { |h,parent_klass|
    h[parent_klass] = Hash.new { |i,parent_id|
      i[parent_id] = Hash.new { |j,child_klass| j[child_klass] = {} }
    }
  }

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

  result_set.each { |row_hash|
    # CPK
    #primary_id = type_caster.type_cast row_hash[primary_key]
    primary_id = if row_hash[primary_key].kind_of?(Array)
      row_hash[primary_key].map {|key| type_caster.type_cast key}
    else
      type_caster.type_cast row_hash[primary_key]
    end
    parent = parents[primary_id] ||= join_root.instantiate(row_hash, column_aliases)
    construct(parent, join_root, row_hash, result_set, seen, model_cache, aliases)
  }

  parents.values
end