merge_request_diff.rb

# == Schema Information
#
# Table name: merge_request_diffs
#
#  id               :integer          not null, primary key
#  state            :string(255)
#  st_commits       :text
#  st_diffs         :text
#  merge_request_id :integer          not null
#  created_at       :datetime
#  updated_at       :datetime
#

require Rails.root.join("app/models/commit")

class MergeRequestDiff < ActiveRecord::Base
  include Sortable

  # Prevent store of diff if commits amount more then 500
  COMMITS_SAFE_SIZE = 500

  attr_reader :commits, :diffs

  belongs_to :merge_request

  delegate :target_branch, :source_branch, to: :merge_request, prefix: nil

  state_machine :state, initial: :empty do
    state :collected
    state :timeout
    state :overflow_commits_safe_size
    state :overflow_diff_files_limit
    state :overflow_diff_lines_limit
  end

  serialize :st_commits
  serialize :st_diffs

  after_create :reload_content

  def reload_content
    reload_commits
    reload_diffs
  end

  def diffs
    @diffs ||= (load_diffs(st_diffs) || [])
  end

  def commits
    @commits ||= load_commits(st_commits || [])
  end

  def last_commit
    commits.first
  end

  def last_commit_short_sha
    @last_commit_short_sha ||= last_commit.short_id
  end

  private

  def dump_commits(commits)
    commits.map(&:to_hash)
  end

  def load_commits(array)
    array.map { |hash| Commit.new(Gitlab::Git::Commit.new(hash), merge_request.source_project) }
  end