impress/app/models/closet_hanger.rb

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class ClosetHanger < ActiveRecord::Base
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include Flex::Model
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belongs_to :item
belongs_to :list, :class_name => 'ClosetList'
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belongs_to :user
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attr_accessible :list_id, :owned, :quantity
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validates :item_id, :uniqueness => {:scope => [:user_id, :owned, :list_id]}
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validates :quantity, :numericality => {:greater_than => 0}
validates_presence_of :item, :user
validate :list_belongs_to_user
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scope :alphabetical_by_item_name, joins(:item).order(Item.arel_table[:name])
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scope :newest, order(arel_table[:created_at].desc)
scope :owned_before_wanted, order(arel_table[:owned].desc)
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scope :unlisted, where(:list_id => nil)
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{:owned => true, :wanted => false}.each do |name, owned|
scope "#{name}_trading", joins(:user).includes(:list).
where(:owned => owned).
where((
arel_table[:list_id].eq(nil).and(
User.arel_table["#{name}_closet_hangers_visibility"].gteq(ClosetVisibility[:trading].id)
)
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).or(
ClosetList.arel_table[:visibility].gteq(ClosetVisibility[:trading].id)
))
end
before_validation :merge_quantities, :set_owned_by_list
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flex.parent :item, 'item' => 'closet_hanger'
flex.sync self
def flex_source
{
:user_id => user_id,
:item_id => item_id,
:owned => owned?
}.to_json
end
def verb(subject=:someone)
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self.class.verb(subject, owned?)
end
def self.verb(subject, owned, positive=true)
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base = (owned) ? 'own' : 'want'
base << 's' if positive && subject != :you && subject != :i
base
end
def self.set_quantity!(quantity, options)
quantity = quantity.to_i
conditions = {:user_id => options[:user_id].to_i,
:item_id => options[:item_id].to_i}
if options[:key] == "true"
conditions[:owned] = true
conditions[:list_id] = nil
elsif options[:key] == "false"
conditions[:owned] = false
conditions[:list_id] = nil
else
conditions[:list_id] = options[:key].to_i
end
hanger = self.where(conditions).first
if quantity > 0
# If quantity is non-zero, create/update the corresponding hanger.
unless hanger
hanger = self.new
hanger.user_id = conditions[:user_id]
hanger.item_id = conditions[:item_id]
# One of the following will be nil, and that's okay. If owned is nil,
# we'll cover for it before validation, as always.
hanger.owned = conditions[:owned]
hanger.list_id = conditions[:list_id]
end
hanger.quantity = quantity
hanger.save!
elsif hanger
# If quantity is zero and there's a hanger, destroy it.
hanger.destroy
end
# If quantity is zero and there's no hanger, good. Do nothing.
end
protected
def list_belongs_to_user
if list_id?
if list
errors.add(:list_id, "must belong to you") unless list.user_id == user_id
else
errors.add(:list, "must exist")
end
end
end
def merge_quantities
# Find a hanger that conflicts: for the same item, in the same user's
# closet, same owned status, same list. It also must not be the current
# hanger.
conflicting_hanger = self.class.select([:id, :quantity]).
where(:user_id => user_id, :item_id => item_id, :owned => owned,
:list_id => list_id).where(['id != ?', self.id]).first
# If there is such a hanger, remove it and merge its quantity into this one.
if conflicting_hanger
self.quantity += conflicting_hanger.quantity
conflicting_hanger.destroy
end
true
end
def set_owned_by_list
self.owned = list.hangers_owned if list
true
end
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end