Class: AwesomeO::Cart

Inherits:
Object
  • Object
show all
Defined in:
lib/awesome_o/cart.rb

Constant Summary collapse

CART_LINE_ITEM_ID_KEY = 
'awesome_o:line_item:id'.freeze

Instance Method Summary collapse

Constructor Details

#initialize(uid) ⇒ Cart

Returns a new instance of Cart.



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# File 'lib/awesome_o/cart.rb', line 5

def initialize(uid)
  @uid = uid
end

Instance Method Details

#add_item(options) ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 9

def add_item(options)
  raise 'Must specify both :id and :type' unless options.key?(:id) && options.key?(:type)
  line_item_id = redis.incr CART_LINE_ITEM_ID_KEY
  redis.pipelined do
    redis.mapped_hmset("awesome_o:line_item:#{line_item_id}", options)
    redis.hincrby("awesome_o:line_item:#{line_item_id}", :_version, 1)
    redis.sadd key, line_item_id
    redis.sadd index_key, "#{options[:type]}:#{options[:id]}"
    redis.set index_key_for(options), line_item_id
  end
  touch
  get_item(line_item_id)
end

#cache_key ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 115

def cache_key
  "cart/#{@uid}-#{version}"
end

#contains?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/awesome_o/cart.rb', line 40

def contains?(object)
  redis.sismember index_key, "#{object.class}:#{object.id}"
end

#count ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 48

def count
  redis.scard key
end

#destroy! ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 68

def destroy!
  keys = line_item_keys
  keys << key
  keys << index_key
  keys << index_keys
  keys.flatten!
  redis.pipelined do
    keys.each do |key|
      redis.del key
    end
  end
end

#find(object) ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 44

def find(object)
  get_item(redis.get(index_key_for(object)).to_i) if contains?(object)
end

#items(type = nil) ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 31

def items(type = nil)
  if type
    items = line_item_ids.collect { |item_id| get_item(item_id) }.select { |item| item.type == type }
    return ItemCollection.new(items)
  else
    return ItemCollection.new(line_item_ids.collect { |item_id| get_item(item_id) })
  end
end

#quantity ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 52

def quantity
  line_item_keys.collect do |item_key|
    redis.hget item_key, AwesomeO.config.quantity_field
  end.inject(0) { |sum, quantity| sum += quantity.to_i }
end

#reassign(new_id) ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 101

def reassign(new_id)
  if redis.exists key
    new_index_keys = items.collect do |item|
      index_key_for(item, new_id)
    end
    redis.rename key, key(new_id)
    redis.rename index_key, index_key(new_id)
    index_keys.zip(new_index_keys).each do |key, value|
      redis.rename key, value
    end
  end
  @uid = new_id
end

#remove_item(item) ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 23

def remove_item(item)
  redis.del "awesome_o:line_item:#{item._id}"
  redis.srem key, item._id
  redis.srem index_key, "#{item.type}:#{item.id}"
  redis.del index_key_for(item)
  touch
end

#total ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 58

def total
  items.collect do |item|
    (item.cost * 100).to_i
  end.inject(0) { |sum, cost| sum += cost } / 100.0
end

#touch ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 81

def touch
  keys_to_expire = line_item_keys
  keys_to_expire << key
  if redis.exists index_key
    keys_to_expire << index_key
    keys_to_expire << index_keys
    keys_to_expire.flatten!
  end
  redis.pipelined do
    keys_to_expire.each do |item|
      redis.expire item, AwesomeO.config.cart_expires_in
    end
  end
  redis.hincrby self.class.versions_key, version_key, 1
end

#ttl ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 64

def ttl
  redis.ttl key
end

#version ⇒ Object 



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# File 'lib/awesome_o/cart.rb', line 97

def version
  redis.hget(self.class.versions_key, version_key).to_i
end