```ruby
module Spree
  class PaymentMethod < ActiveRecord::Base
    DISPLAY = [:both, :front_end, :back_end]
    default_scope where(:deleted_at => nil)

    scope :production, lambda { where(:environment => 'production') }

    attr_accessible :name, :description, :environment, :display_on, :active

    def self.providers
      Rails.application.config.spree.payment_methods
    end

    def provider_class
      raise 'You must implement provider_class method for this gateway.'
    end

    # The class that will process payments for this payment type, used for @payment.source
    # e.g. CreditCard in the case of a the Gateway payment type
    # nil means the payment method doesn't require a source e.g. check
    def payment_source_class
      raise 'You must implement payment_source_class method for this gateway.'
    end

    def self.available(display_on = 'both')
      all.select { |p| p.active && (p.display_on == display_on.to_s || p.display_on.blank?) && (p.environment == Rails.env || p.environment.blank?) }
    end

    def self.active?
      where(:type => self.to_s, :environment => Rails.env, :active => true).count > 0
    end

    def method_type
      type.demodulize.downcase
    end

    def destroy
      touch :deleted_at
    end

    def self.find_with_destroyed *args
      self.with_exclusive_scope { find(*args) }
    end

    def payment_profiles_supported?
      false
    end

    def source_required?
      true
    end
  end
end
```

Cut down PaymentMethod.available to be more readable
user
```ruby
module Spree
  class PaymentMethod < ActiveRecord::Base
    DISPLAY = [:both, :front_end, :back_end]
    default_scope where(:deleted_at => nil)

    scope :production, lambda { where(:environment => 'production') }

    attr_accessible :name, :description, :environment, :display_on, :active

    def self.providers
      Rails.application.config.spree.payment_methods
    end

    def provider_class
      raise 'You must implement provider_class method for this gateway.'
    end

    # The class that will process payments for this payment type, used for @payment.source
    # e.g. CreditCard in the case of a the Gateway payment type
    # nil means the payment method doesn't require a source e.g. check
    def payment_source_class
      raise 'You must implement payment_source_class method for this gateway.'
    end

    def self.available(display_on = 'both')
      all.select do |p|
        p.active &&
        (p.display_on == display_on.to_s || p.display_on.blank?) &&
        (p.environment == Rails.env || p.environment.blank?)
      end
    end

    def self.active?
      where(:type => self.to_s, :environment => Rails.env, :active => true).count > 0
    end

    def method_type
      type.demodulize.downcase
    end

    def destroy
      touch :deleted_at
    end

    def self.find_with_destroyed *args
      self.with_exclusive_scope { find(*args) }
    end

    def payment_profiles_supported?
      false
    end

    def source_required?
      true
    end
  end
end
```
assistant