Contents

module Trade
  module Model::Promote
    extend ActiveSupport::Concern

    included do
      attribute :name, :string
      attribute :short_name, :string
      attribute :code, :string
      attribute :description, :string
      attribute :scope, :string
      attribute :metering, :string
      attribute :editable, :boolean, default: false, comment: '是否可更改价格'
      attribute :verified, :boolean, default: false
      attribute :extra, :json

      belongs_to :organ, optional: true
      belongs_to :deal, polymorphic: true, optional: true
      has_many :promote_charges, dependent: :delete_all
      has_many :promote_extras, dependent: :delete_all
      has_many :promote_goods, dependent: :destroy
      has_many :promote_carts, dependent: :destroy

      scope :verified, -> { where(verified: true) }
      scope :default, -> { verified.where(default: true) }
      scope :for_sale, -> { verified.where(default: false) }

      validates :code, uniqueness: true, allow_blank: true

      enum scope: {
        single: 'single',  # 适用于单独计算商品
        overall: 'overall'  # 适用于多个商品一起计算
      }
      enum metering: {
        number: 'number',  # 商品购买件数
        weight: 'weight',  # 商品总重量，support sequence
        volume: 'volume',  # 商品总体积, support sequence
        original_amount: 'original_amount'  # 商品总金额, support sequence
      }
    end

    def extra_mappings
      promote_extras.pluck(:extra_name, :column_name).to_h
    end

    def compute_charge(value, **extra)
      extra.transform_keys! { |key| extra_mappings[key.to_s] }
      extra.delete nil

      q_params = {
        'min-lte': value,
        'max-gte': value,
        **extra
      }

      promote_charges.default_where(q_params).take
    end

  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rails_trade-0.0.3	app/models/trade/model/promote.rb