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class Submission < ActiveRecord::Base
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belongs_to :language
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belongs_to :problem
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belongs_to :user
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before_validation :assign_problem
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before_validation :assign_language
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validates_presence_of :source
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validates_length_of :source, :maximum => 100_000, :allow_blank => true, :message => 'too long'
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validates_length_of :source, :minimum => 1, :allow_blank => true, :message => 'too short'
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validate :must_have_valid_problem
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validate :must_specify_language
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before_save :assign_latest_number_if_new_recond
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def self.find_last_by_user_and_problem(user_id, problem_id)
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last_sub = find(:first,
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:conditions => {:user_id => user_id,
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:problem_id => problem_id},
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:order => 'number DESC')
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return last_sub
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end
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def self.find_all_last_by_problem(problem_id)
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# need to put in SQL command, maybe there's a better way
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Submission.includes(:user).find_by_sql("SELECT * FROM submissions " +
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"WHERE id = " +
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"(SELECT MAX(id) FROM submissions AS subs " +
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"WHERE subs.user_id = submissions.user_id AND " +
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"problem_id = " + problem_id.to_s + " " +
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"GROUP BY user_id) " +
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"ORDER BY user_id")
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end
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def self.find_in_range_by_user_and_problem(user_id, problem_id,since_id,until_id)
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records = Submission.where(problem_id: problem_id,user_id: user_id)
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records = records.where('id >= ?',since_id) if since_id > 0
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records = records.where('id <= ?',until_id) if until_id > 0
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records.all
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end
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def self.find_last_for_all_available_problems(user_id)
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submissions = Array.new
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problems = Problem.find_available_problems
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problems.each do |problem|
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sub = Submission.find_last_by_user_and_problem(user_id, problem.id)
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submissions << sub if sub!=nil
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end
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submissions
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end
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def self.find_by_user_problem_number(user_id, problem_id, number)
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Submission.find(:first,
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:conditions => {
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:user_id => user_id,
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:problem_id => problem_id,
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:number => number
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})
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end
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def self.find_all_by_user_problem(user_id, problem_id)
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Submission.find(:all,
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:conditions => {
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:user_id => user_id,
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:problem_id => problem_id,
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})
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end
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def download_filename
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if self.problem.output_only
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return self.source_filename
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else
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timestamp = self.submitted_at.localtime.strftime("%H%M%S")
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return "#{self.problem.name}-#{timestamp}.#{self.language.ext}"
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end
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end
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protected
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def self.find_option_in_source(option, source)
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if source==nil
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return nil
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end
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i = 0
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source.each_line do |s|
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if s =~ option
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words = s.split
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return words[1]
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end
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i = i + 1
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if i==10
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return nil
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end
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end
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return nil
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end
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def self.find_language_in_source(source, source_filename="")
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langopt = find_option_in_source(/^LANG:/,source)
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if langopt
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return (Language.find_by_name(langopt) ||
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Language.find_by_pretty_name(langopt))
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else
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if source_filename
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return Language.find_by_extension(source_filename.split('.').last)
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else
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return nil
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end
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end
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end
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def self.find_problem_in_source(source, source_filename="")
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prob_opt = find_option_in_source(/^TASK:/,source)
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if problem = Problem.find_by_name(prob_opt)
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return problem
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else
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if source_filename
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return Problem.find_by_name(source_filename.split('.').first)
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else
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return nil
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end
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end
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end
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def assign_problem
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if self.problem_id!=-1
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begin
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self.problem = Problem.find(self.problem_id)
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rescue ActiveRecord::RecordNotFound
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self.problem = nil
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end
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else
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self.problem = Submission.find_problem_in_source(self.source,
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self.source_filename)
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end
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end
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def assign_language
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self.language = Submission.find_language_in_source(self.source,
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self.source_filename)
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end
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# validation codes
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def must_specify_language
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return if self.source==nil
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# for output_only tasks
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return if self.problem!=nil and self.problem.output_only
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if self.language==nil
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errors.add('source',"Cannot detect language. Did you submit a correct source file?") unless self.language!=nil
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end
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end
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def must_have_valid_problem
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return if self.source==nil
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if self.problem==nil
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errors.add('problem',"must be specified.")
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elsif (!self.problem.available) and (self.new_record?)
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errors.add('problem',"must be valid.")
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end
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end
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# callbacks
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def assign_latest_number_if_new_recond
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return if !self.new_record?
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latest = Submission.find_last_by_user_and_problem(self.user_id, self.problem_id)
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self.number = (latest==nil) ? 1 : latest.number + 1;
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end
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end
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