Script for media mail

Below is the script for the media mail to add to Script Editor. Test store: designertest2020.myshopify.com

1. Add script editor app - Link
2. Click create script blue button
3. Select shipping rates
4. Select Blank template
5. Click Code button and add code below
6. Name and publish script

Edit line 134 for the Tag Selector: "Media Mail"

Edit line 139 for the Name Selector: "Media Mail"

class Campaign
  def initialize(condition, *qualifiers)
    @condition = (condition.to_s + '?').to_sym
    @qualifiers = PostCartAmountQualifier ? [] : [] rescue qualifiers.compact
    @line_item_selector = qualifiers.last unless @line_item_selector
    qualifiers.compact.each do |qualifier|
      is_multi_select = qualifier.instance_variable_get(:@conditions).is_a?(Array)
      if is_multi_select
        qualifier.instance_variable_get(:@conditions).each do |nested_q|
          @post_amount_qualifier = nested_q if nested_q.is_a?(PostCartAmountQualifier)
          @qualifiers << qualifier
        end
      else
        @post_amount_qualifier = qualifier if qualifier.is_a?(PostCartAmountQualifier)
        @qualifiers << qualifier
      end
    end if @qualifiers.empty?
  end

  def qualifies?(cart)
    return true if @qualifiers.empty?
    @unmodified_line_items = cart.line_items.map do |item|
      new_item = item.dup
      new_item.instance_variables.each do |var|
        val = item.instance_variable_get(var)
        new_item.instance_variable_set(var, val.dup) if val.respond_to?(:dup)
      end
      new_item
    end if @post_amount_qualifier
    @qualifiers.send(@condition) do |qualifier|
      is_selector = false
      if qualifier.is_a?(Selector) || qualifier.instance_variable_get(:@conditions).any? { |q| q.is_a?(Selector) }
        is_selector = true
      end rescue nil
      if is_selector
        raise "Missing line item match type" if @li_match_type.nil?
        cart.line_items.send(@li_match_type) { |item| qualifier.match?(item) }
      else
        qualifier.match?(cart, @line_item_selector)
      end
    end
  end

  def run_with_hooks(cart)
    before_run(cart) if respond_to?(:before_run)
    run(cart)
    after_run(cart)
  end

  def after_run(cart)
    @discount.apply_final_discount if @discount && @discount.respond_to?(:apply_final_discount)
    revert_changes(cart) unless @post_amount_qualifier.nil? || @post_amount_qualifier.match?(cart)
  end

  def revert_changes(cart)
    cart.instance_variable_set(:@line_items, @unmodified_line_items)
  end
end

class ConditionallyHideRates < Campaign
  def initialize(condition, customer_qualifier, cart_qualifier, li_match_type, line_item_qualifier, rate_selector)
    super(condition, customer_qualifier, cart_qualifier, line_item_qualifier)
    @li_match_type = (li_match_type.to_s + '?').to_sym
    @rate_selector = rate_selector
  end

  def run(rates, cart)
    rates.delete_if { |rate| @rate_selector.match?(rate) } if qualifies?(cart)
  end
end

class Selector
  def partial_match(match_type, item_info, possible_matches)
    match_type = (match_type.to_s + '?').to_sym
    if item_info.kind_of?(Array)
      possible_matches.any? do |possibility|
        item_info.any? do |search|
          search.send(match_type, possibility)
        end
      end
    else
      possible_matches.any? do |possibility|
        item_info.send(match_type, possibility)
      end
    end
  end
end

class ProductTagSelector < Selector
  def initialize(match_type, match_condition, tags)
    @match_condition = match_condition
    @invert = match_type == :does_not
    @tags = tags.map(&:downcase)
  end

  def match?(line_item)
    product_tags = line_item.variant.product.tags.to_a.map(&:downcase)
    case @match_condition
      when :match
        return @invert ^ ((@tags & product_tags).length > 0)
      else
        return @invert ^ partial_match(@match_condition, product_tags, @tags)
    end
  end
end

class RateNameSelector < Selector
  def initialize(match_type, match_condition, names)
    @match_condition = match_condition
    @invert = match_type == :does_not
    @names = names.map(&:downcase)
  end

  def match?(shipping_rate)
    name = shipping_rate.name.downcase
    case @match_condition
      when :match
        return @invert ^ @names.include?(name)
      else
        return @invert ^ partial_match(@match_condition, name, @names)
    end
  end
end

CAMPAIGNS = [
  ConditionallyHideRates.new(
    :any,
    nil,
    nil,
    :any,
    ProductTagSelector.new(
      :does_not,
      :match,
      ["Media Mail"]
    ),
    RateNameSelector.new(
      :does,
      :match,
      ["Media Mail"]
    )
  )
].freeze

CAMPAIGNS.each do |campaign|
  campaign.run(Input.shipping_rates, Input.cart)
end

Output.shipping_rates = Input.shipping_rates