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: Aliases, JoinAssociation, JoinPart

Instance Method Summary collapse

Instance Method Details

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



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# File 'lib/composite_primary_keys/associations/join_dependency.rb', line 47

def construct(ar_parent, parent, row, rs, seen, model_cache, aliases)
  primary_id  = ar_parent.id

  parent.children.each do |node|
    if node.reflection.collection?
      other = ar_parent.association(node.reflection.name)
      other.loaded!
    else
      if ar_parent.association_cache.key?(node.reflection.name)
        model = ar_parent.association(node.reflection.name).target
        construct(model, node, row, rs, seen, model_cache, aliases)
        next
      end
    end

    key = aliases.column_alias(node, node.primary_key)

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

    model = seen[parent.base_klass][primary_id][node.base_klass][id]

    if model
      construct(model, node, row, rs, seen, model_cache, aliases)
    else
      model = construct_model(ar_parent, node, row, model_cache, id, aliases)
      seen[parent.base_klass][primary_id][node.base_klass][id] = model
      construct(model, node, row, rs, seen, model_cache, aliases)
    end
  end
end

#instantiate(result_set, aliases) ⇒ Object 



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

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 primary_key.kind_of?(Array)
                   primary_key.map {|key| type_caster.type_cast row_hash[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