The RPG Maker Resource Kit

I've created this script that is supposed to give all items and equipment a variable called "space". I've created a script so I can use notetags for this:

module DRAGONISW
   
  ITEM_SPACE = /<(?:SPACE|space):[ ](\d+)>/i
   
end # DRAGONISW

#==============================================================================
# ? DataManager
#==============================================================================

module DataManager
 
  #--------------------------------------------------------------------------
  # alias method: load_database
  #--------------------------------------------------------------------------
  class <<self; alias load_database_isw load_database; end
  def self.load_database
    load_database_isw
    load_notetags_isw
  end
 
  #--------------------------------------------------------------------------
  # new method: load_notetags_aim
  #--------------------------------------------------------------------------
  def self.load_notetags_isw
    groups = [$data_items, $data_weapons, $data_armors]
    for group in groups
      for obj in group
        next if obj.nil?
        obj.load_notetags_isw
      end
    end
  end
 
end # DataManager

#==============================================================================
# ? RPG::BaseItem
#==============================================================================

class RPG::BaseItem
 
  #--------------------------------------------------------------------------
  # public instance variables
  #--------------------------------------------------------------------------
  attr_accessor :space
 
  #--------------------------------------------------------------------------
  # common cache: load_notetags_aim
  #--------------------------------------------------------------------------
  def load_notetags_isw
    @space = 0
    #---
    self.note.split(/[\r\n]+/).each { |line|
      case line
      #---
      when DRAGONISW::ITEM_SPACE
        @space = $1.to_i
      end
    } # self.note.split
    #---
  end
 
end # RPG::BaseItem


#==============================================================================
# Game_Interpreter
#==============================================================================
class Game_Interpreter
 
  def inv_item_space
    amount = 0
    for i in 0..999
      item = $data_items[i]
      amount += $game_party.item_number(item) * item.space
    end
    return amount
  end
 
end # Game_Interpreter


I try testing it out by calling the script code:
$game_variables[2] = inv_item_space

But I keep getting this error:

QuoteScript 'Game_Interpreter'  line 1409: NoMethodError occurred.

undefined method `space' for nil:NilClass

I tried testing it on a brand new game and I still got this error. I've looked at many script that use notetags and it seems like I'm doing it correctly, so I don't understand what I'm doing wrong.

The first element of $data_items, $data_weapons and $data_armors is a nil value. This is because there isn't an item with ID of 0. It starts at 1. This is the same for any of the other information in the database too.

You will want to move to the next ID if the item found is nil:

Something like:


  def inv_item_space
    amount = 0
    for i in 0..999
      item = $data_items[i]
      next if item.nil?
      amount += $game_party.item_number(item) * item.space
    end
    return amount
  end


should help avoid that.

Quote from: LoganF on February 03, 2013, 11:08:14 PM
The first element of $data_items, $data_weapons and $data_armors is a nil value. This is because there isn't an item with ID of 0. It starts at 1. This is the same for any of the other information in the database too.

You will want to move to the next ID if the item found is nil:

Something like:

Code Select Expand


  def inv_item_space
    amount = 0
    for i in 0..999
      item = $data_items[i]
      next if item.nil?
      amount += $game_party.item_number(item) * item.space
    end
    return amount
  end


should help avoid that.

Thanks that worked perfectly. It's funny because I tried making it "for i in 1..999", but that didn't work either.

I gave that a go too, but that came up with the same error: a "no method for nil:NilClass". This just ensures that you won't be calling the method on a nil object.

Well, you could limit it to the number of items in the array, so instead of 0..999, it could be:


for i in 1...$data_items.size


But anyway, the nil check does the trick too and there might be some custom scripts out there which would make it so that some elements were nil even limiting it to the size of $data_items.