lib/manifest/list_group/list/play.rb

   1 module Manifest
   2   module ListGroupModule
   3     module ListModule
   4       class PlayList
   5         attr :list_group, :list_name, :list_manifest
   6
   7         def initialize list_group, list_name, list_manifest
   8           @list_group = list_group
   9           @list_name = list_name
  10           @list_manifest = list_manifest
  11           self.set_default
  12           self.init
  13         end
  14
  15         def set_default
  16           return
  17           @default_page_size = @conf['default_page_size'] || 25
  18           @max_page_size = @conf['max_page_size'] || 100
  19           @params_offset = params_offset
  20           @params_count = params_count
  21           @list_list_conf = @manifest.list(@item_name).lists[list_name] || {}
  22           @model_name = @list_list_conf['model']
  23           @filter_key = @list_list_conf['filter_key']
  24           @model = @model_name.classify.constantize
  25           @table_name = @model.table_name
  26           if @model.content?
  27             @owner_model = @model.owner_model
  28             @owner_table_name = @owner_model.table_name if @owner_model
  29           end
  30         end
  31
  32         def init
  33         end
  34
  35         def offset cnt, prm = nil
  36           offset = prm.to_i
  37           offset = cnt - 1 if offset >= cnt
  38           offset = cnt - offset.abs if offset < 0
  39           offset = 0 if offset < 0
  40           offset
  41         end
  42
  43         def limit prm
  44           prm ||= @default_page_size
  45           count = prm.to_i
  46           count = @max_page_size if count > @max_page_size
  47           count = @default_page_size if count < 1
  48           count
  49         end
  50
  51         def count filter_item
  52           @count ||= @model.count(:conditions => self.where(filter_item), :include => self.includes).to_i
  53         end
  54
  55         def where filter_item
  56           w = @model.list_where
  57           w += ' and ' unless w.blank?
  58           [w + @table_name + '.' + @filter_key + ' = ?', filter_item.id]
  59         end
  60
  61         def includes
  62           {@owner_model.item_name => {}}
  63         end
  64
  65         def order
  66           @table_name + '.t'
  67         end
  68
  69         def items filter_item
  70           c  = @count || self.count(filter_item)
  71           o  = self.offset c, @offset
  72           l  = self.limit @count
  73           @model.where(self.where(filter_item)).includes(self.includes).order(self.order).offset(o).limit(l)
  74         end
  75
  76         def prev_offset filter_item
  77           c  = @count || self.count(filter_item)
  78           o  = self.offset c, @offset
  79           l  = self.limit @count
  80           if o > 0
  81             if o - l < 0
  82               0
  83             else
  84               o - l
  85             end
  86           else
  87             nil
  88           end
  89         end
  90
  91         def next_offset filter_item
  92           c  = @count || self.count(filter_item)
  93           o  = self.offset c, @offset
  94           l  = self.limit @count
  95           if o + l > c
  96             nil
  97           else
  98             o + l
  99           end
 100         end
 101
 102         def self.add_action item_name, action_name, list_name, list_conf
 103           return
 104         end
 105       end
 106
 107     end
 108   end
 109 end