From: nick314 <nick314@...>
Date: 2007-08-19T18:24:02+09:00
Subject: Symbol as array index error

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I don't know why this code got Symbol as array index error.
Please help me out.
nick314

cl/xmlserial  is the library of REXML

require 'yaml'
require 'cl/xmlserial'

class Person
  include XmlSerialization
  attr_accessor :account, :name, :penalty, :problems, :hash
  def initialize(account, name, penalty=3D0, problems=3D0, hash=3D{})
    @account =3D account
    @name =3D name=20
    @penalty =3D penalty.to_i
    @problems =3D problems.to_i
    @hash =3D hash
  end
 =20
  def add_problem begin_time, problem, result, submit_time
    if @hash.has_key?(problem) and @hash[problem] <=3D 0=20
      return
    end
    # ...
    if result =3D=3D 2
      @penalty +=3D submit_time - begin_time
      @problems +=3D 1
      if @hash.has_key?(problem)
        @penalty +=3D @hash[problem] * 20*60
      else=20
        @hash[problem] =3D 0
      end
      @hash[problem] *=3D -1
    else
      if @hash.has_key?(problem)
        @hash[problem] +=3D 1
      else
        @hash[problem] =3D 1
      end
    end
  end

  def inspect
    "#@account, #@problems, #@penalty"
  end
end

# sort criteria =3D> high problems, low penalty, lexicographical account
class Person
  include XmlSerialization=20
  def <=3D>(other)
    if @problems =3D=3D other.problems
      if @penalty =3D=3D other.penalty
        return @account <=3D> other.account
      else
        return @penalty <=3D> other.penalty
      end
    else
      return other.problems <=3D> @problems
    end
  end
end

class ContestBoard
  include XmlSerialization
  attr_accessor :people, :begin_time, :problems
  def initialize begin_time, problems=3Dnil=20
    @people =3D []
    @begin_time =3D begin_time
    @problems =3D problems
  end=20
 =20
  def add account, problem, result, submit_time
    if find(account).nil?
      person =3D Person.new(account, User.find (account).name)
      person.add_problem(begin_time, problem, result, submit_time)
      @people << person
    else
      index =3D find(account)
      people[index].add_problem(begin_time, problem, result, =
submit_time)=20
    end
  end
 =20
  def find account
    index =3D 0
    @people.each { |p|
      if p.account =3D=3D account
        return index
      end
      index +=3D 1
    }
    return nil
  end
 =20
  def show
    for person in @people
      puts person.inspect
    end
  end
 =20
  def sort
    @people =3D @people.sort
  end
end

class Serialization
  include XmlSerialization
  attr_accessor :classType, :type
  def initialize classType=3DContestBoard, type=3D"yaml"
    @classType =3D classType
    @type =3D type
  end
 =20
  def serialize obj
    if @type =3D=3D "yaml"=20
      return YAML_serialize obj
    elsif @type =3D=3D "xml"
      return XML_serialize(obj)
    end
  end

  def unserialize
    if @type =3D=3D "yaml"
      return YAML_unserialize obj=20
    elsif @type =3D=3D "yaml"
      return XML_unserialize obj
    end
  end
 =20
  private
  def YAML_serialize obj
    return YAML.dump(obj)=20
  end
 =20
  def YAML_unserialize sObj
    return YAML.load(sObj)
  end
 =20
  def XML_serialize obj
    return obj.to_xml
  end
 =20
  def XML_unserialize sObj
    doc =3D REXML::Document.new(sObj);
    return @classType.from_xml(doc.root )
  end
end

# ...
class ContestsController < ApplicationController
  def index
    list
    render :action =3D> 'list'
  end

  # GETs should be safe (see =
http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method =3D> :post, :only =3D> [ :destroy, :create, :update ],
         :redirect_to =3D> { :action =3D> :list }

# contest_board method
  def contest_board=20
    @now_contest =3D Contest.find( get_now_contest );
    if !@now_contest.nil?
      solveinfos =3D @now_contest.solveinfos.find(:all, :order =3D> =
"created_at ASC");
      #solveinfos =3D @now_contest.solveinfos.find(:all, :conditions =
=3D> "solveStatus =3D 2", :order =3D> "created_at ASC");=20
      # get many solveinfo
      @board =3D ContestBoard.new(@now_contest.from)
      for solveinfo in solveinfos
        @board.add(solveinfo.userID, solveinfo.problemID, =
solveinfo.solveStatus, solveinfo.created_at );
      end
      @board.sort
      @users =3D User.find(:all)
     =20
      #@past_contest =3D PastContests.new
      #@serialization =3D Serialization.new(@board)
      #@past_contest.contest_id =3D @now_contest.id=20
      #@past_contest.format =3D 'yaml'
      #@past_contest.serialization =3D  @serialization.serialize
      #@past_contest.save
     =20
      puts @board.to_xml
      #@past_contest =3D PastContests.new=20
      #@serialization =3D Serialization.new(ContestBoard, 'xml')
      #@past_contest.contest_id =3D @now_contest.id
      #@past_contest.format =3D 'xml'
      #@past_contest.serialization =3D  @serialization.serialize @board
      #@past_contest.save
     =20
    end
  end
 =20
  def contest_board_test
    @board =3D ContestBoard.new
    @board.add('nick314', 1, 1, 10)
    @board.add('nick314', 1, 2, 10)=20
    @board.add('nick314', 2, 1, 10)
    @board.add('nick314', 2, 1, 10)
    @board.add('nick314', 2, 2, 10)
    @board.sort
  end

# get_now_contest method=20
  def get_now_contest=20
    # there won't be two contests overlayped
    now =3D Time.now
    for contest in Contest.find(:all)
      if  now >=3D contest.from and now < contest.to
        return contest.id
      end
    end
    return nil
  end
 =20
# list method=20
  def list
    @contest1 =3D Contest.find(1)
    @solveinfo =3D @contest1.solveinfos
    @solved_problem =3D @ solveinfo.find(:all)
    # this is wrong
    #@contest1.solveinfos << Solveinfo.find( 221 )
    @contests_pages, @contests =3D paginate :contests, :per_page =3D> 10
  end

# show method=20
  def show=20
    @contests =3D Contest.find(params[:id])
  end

# new method=20
  def new
    @contests =3D Contest.new
  end
 =20
# create method=20
  def create
    @contests =3D Contest.new(params[:contests])
    if @contests.save
      flash[:notice] =3D 'Contests was successfully created.'
      redirect_to :action =3D> 'list'
    else
      render :action =3D> 'new'
    end
  end

# edit method=20
  def edit
    @contests =3D Contest.find(params[:id])
  end

# update method=20
  def update
    @contests =3D Contest.find(params[:id])
    if @contests.update_attributes(params[:contests])=20
      flash[:notice] =3D 'Contest was successfully updated.'
      redirect_to :action =3D> 'show', :id =3D> @contests
    else
      render :action =3D> 'edit'
    end
  end

# destroy method=20
  def destroy
    Contest.find(params[:id]).destroy
    redirect_to :action =3D> 'list'
  end
end


--=20
I am Nick314=20

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