class Item < ActiveRecord::Base include ItemsHelper belongs_to :user has_many :synapses1, :class_name => 'Synapse', :foreign_key => 'node1_id' has_many :synapses2, :class_name => 'Synapse', :foreign_key => 'node2_id' has_many :items1, :through => :synapses2, :source => :item1 has_many :items2, :through => :synapses1, :source => :item2 has_many :mappings has_many :maps, :through => :mappings def synapses synapses1 + synapses2 end def relatives items1 + items2 end belongs_to :item_category # has no viewable synapses helper function def has_viewable_synapses(current) result = false self.synapses.each do |synapse| if synapse.authorize_to_view(current) result = true end end return result end ###### JSON ###### def self_as_json Jbuilder.encode do |json| @itemdata = Hash.new @itemdata['$desc'] = self.desc @itemdata['$link'] = self.link @itemdata['$itemcatname'] = self.item_category.name @itemdata['$userid'] = self.user.id @itemdata['$username'] = self.user.name json.data @itemdata json.id self.id json.name self.name end end #build a json object of everything connected to a specified node def network_as_json(current) Jbuilder.encode do |json| @items = network(self,nil,4) if @items.count > 1 json.array!(@items.delete_if{|item| (not item.authorize_to_view(current)) || (not item.has_viewable_synapses(current))}) do |item| json.adjacencies item.synapses1.delete_if{|synapse| (not @items.include?(synapse.item2)) || (not synapse.authorize_to_view(current)) || (not synapse.item2.authorize_to_view(current)) } do |json, synapse| json.nodeTo synapse.node2_id json.nodeFrom synapse.node1_id @synapsedata = Hash.new @synapsedata['$desc'] = synapse.desc @synapsedata['$showDesc'] = false @synapsedata['$category'] = synapse.category @synapsedata['$id'] = synapse.id @synapsedata['$userid'] = synapse.user.id @synapsedata['$username'] = synapse.user.name @synapsedata['$direction'] = [synapse.node1_id.to_s(), synapse.node2_id.to_s()] json.data @synapsedata end @itemdata = Hash.new @itemdata['$desc'] = item.desc @itemdata['$link'] = item.link @itemdata['$itemcatname'] = item.item_category.name @itemdata['$userid'] = item.user.id @itemdata['$username'] = item.user.name json.data @itemdata json.id item.id json.name item.name end elsif @items.count == 1 json.array!(@items) do |item| @itemdata = Hash.new @itemdata['$desc'] = item.desc @itemdata['$link'] = item.link @itemdata['$itemcatname'] = item.item_category.name @itemdata['$userid'] = item.user.id @itemdata['$username'] = item.user.name json.data @itemdata json.id item.id json.name item.name end end end end ##### PERMISSIONS ###### scope :visibleToUser, lambda { |current, user| if user != nil if user != current Item.find_all_by_user_id_and_permission(user.id, "commons") | Item.find_all_by_user_id_and_permission(user.id, "public") elsif user == current Item.find_all_by_user_id_and_permission(user.id, "commons") | Item.find_all_by_user_id_and_permission(user.id, "public") | current.items.where(:permission => "private") end elsif (current != nil && user == nil) Item.find_all_by_permission("commons") | Item.find_all_by_permission("public") | current.items.where(:permission => "private") elsif (current == nil) Item.find_all_by_permission("commons") | Item.find_all_by_permission("public") end } # returns false if user not allowed to 'show' Topic, Synapse, or Map def authorize_to_show(user) if (self.permission == "private" && self.user != user) return false end return self end # returns false if user not allowed to 'edit' Topic, Synapse, or Map def authorize_to_edit(user) if (self.permission == "private" && self.user != user) return false elsif (self.permission == "public" && self.user != user) return false end return self end # returns Boolean if user allowed to view Topic, Synapse, or Map def authorize_to_view(user) if (self.permission == "private" && self.user != user) return false end return true end # returns Boolean based on whether user has permissions to edit or not def authorize_linkto_edit(user) if (self.user == user) return true elsif (self.permission == "commons") return true end return false end end