Class: Cartman::Cart

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

Constant Summary collapse

CART_LINE_ITEM_ID_KEY = 
"cartman:line_item:id"

Instance Method Summary collapse

Constructor Details

#initialize(uid) ⇒ Cart

Returns a new instance of Cart.



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

def initialize(uid)
  @uid = uid
end

Instance Method Details

#add_item(options) ⇒ Object 



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

def add_item(options)
  raise "Must specify both :id and :type" unless options.has_key?(:id) && options.has_key?(:type)
  line_item_id = redis.incr CART_LINE_ITEM_ID_KEY
  redis.pipelined do
    redis.mapped_hmset("cartman:line_item:#{line_item_id}", options)
    redis.hincrby("cartman: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/cartman/cart.rb', line 112

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

#contains?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cartman/cart.rb', line 35

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

#count ⇒ Object 



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# File 'lib/cartman/cart.rb', line 45

def count
  redis.scard key
end

#destroy! ⇒ Object 



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# File 'lib/cartman/cart.rb', line 65

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/cartman/cart.rb', line 39

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

#items ⇒ Object 



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

def items
  ItemCollection.new(line_item_ids.collect{ |item_id| get_item(item_id)})
end

#quantity ⇒ Object 



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# File 'lib/cartman/cart.rb', line 49

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

#reassign(new_id) ⇒ Object 



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# File 'lib/cartman/cart.rb', line 98

def reassign(new_id)
  if redis.exists key
    new_index_keys = items.collect { |item|
      index_key_for(item, new_id)
    }
    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/cartman/cart.rb', line 23

def remove_item(item)
  redis.del "cartman: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/cartman/cart.rb', line 55

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

#touch ⇒ Object 



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# File 'lib/cartman/cart.rb', line 78

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, Cartman.config.cart_expires_in
    end
  end
  redis.hincrby self.class.versions_key, version_key, 1
end

#ttl ⇒ Object 



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# File 'lib/cartman/cart.rb', line 61

def ttl
  redis.ttl key
end

#version ⇒ Object 



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# File 'lib/cartman/cart.rb', line 94

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