class Dynabute::NestedAttributes::Builder

Public Class Methods

new(attributes_list, dynabutee) click to toggle source
# File lib/dynabute/nested_attributes.rb, line 7
def initialize(attributes_list, dynabutee)
  unless attributes_list.is_a?(Hash) || attributes_list.is_a?(Array)
    raise ArgumentError, "Hash or Array expected, got #{attributes_list.class.name} (#{attributes_list.inspect})"
  end
  @attributes_list = normalize_attributes(attributes_list)
  @nested_attributes_to_assign = {}
  @dynabutee = dynabutee
end

Public Instance Methods

build_assignable_attributes() { |nested_attributes_to_assign| ... } click to toggle source
# File lib/dynabute/nested_attributes.rb, line 16
def build_assignable_attributes
  desperados = [] # has_one params without :id key need special care
  collect_fields(@attributes_list)
  @attributes_list.each do |attrs|
    field = resolve_field(attrs)
    next if field.nil?
    next let_go(field, attrs) if field.has_many
    next let_go(field, attrs) if attrs[:id].present?
    desperados.push([attrs, field])
  end

  desperados
    .group_by { |(_, field)| field.value_type }
    .each do |value_type, attrs_fields| # for each value tables

    existing_values = @dynabutee.send(Util.value_relation_name(value_type))
                        .where(field_id: attrs_fields.map{|(_, f)| f.id})
                        .to_a # trying to reduce queries
    attrs_fields.each do |(attrs, field)| # for each attrs
      params = {
        id: existing_values.detect{|v| v.field_id == field.id}.try(:id),
        value: attrs[:value],
        field_id: field.id
      }
      let_go(field, params)
    end
  end
  yield(@nested_attributes_to_assign)
end

Private Instance Methods

collect_fields(attrs) click to toggle source
# File lib/dynabute/nested_attributes.rb, line 65
def collect_fields(attrs)
  params = attrs.each_with_object({field_id: [], name: []}) do |a, memo|
    if a[:field_id] then memo[:field_id].push(a[:field_id])
    elsif a[:name] then memo[:name].push(a[:name])
    else fail FieldNotSpecified end
  end
  table = Dynabute::Field.arel_table
  @field_list = Dynabute::Field.for(@dynabutee.class.name)
    .where( table[:id].in(params[:field_id]).or(table[:name].in(params[:name])) )
end
let_go(field, params) click to toggle source
# File lib/dynabute/nested_attributes.rb, line 76
def let_go(field, params)
  relation = Util.value_relation_name(field.value_type)
  (@nested_attributes_to_assign[relation] ||= []).push(params)
end
normalize_attributes(attributes_list) click to toggle source
# File lib/dynabute/nested_attributes.rb, line 48
def normalize_attributes(attributes_list)
  if attributes_list.is_a? Hash
    attributes_array = if attributes_list.keys.all?{|k| k =~ /\A\d+\Z/}
                        attributes_list.values
                      else
                        [attributes_list]
                 end
  else
    attributes_array = attributes_list
  end
  attributes_array.map{ |a| a.with_indifferent_access }
end
resolve_field(attrs) click to toggle source
# File lib/dynabute/nested_attributes.rb, line 61
def resolve_field(attrs)
  @field_list.detect{|f| f.name == attrs[:name].to_s || f.id == attrs[:field_id].to_i}
end