instiki/app/models/page.rb

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class Page < ActiveRecord::Base
belongs_to :web
has_many :revisions, :order => 'id', :dependent => :destroy
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has_many :wiki_references, :order => 'referenced_name'
has_one :current_revision, :class_name => 'Revision', :order => 'id DESC'
def name
read_attribute(:name).as_utf8
end
def revise(content, name, time, author, renderer)
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revisions_size = new_record? ? 0 : revisions.size
if (revisions_size > 0) and content == current_revision.content and name == self.name
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raise Instiki::ValidationError.new(
"You have tried to save page '#{name}' without changing its content")
end
self.name = name
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author = Author.new(author.to_s) unless author.is_a?(Author)
# Try to render content to make sure that markup engine can take it,
renderer.revision = Revision.new(
:page => self, :content => content, :author => author, :revised_at => time)
renderer.display_content(update_references = true)
# A user may change a page, look at it and make some more changes - several times.
# Not to record every such iteration as a new revision, if the previous revision was done
# by the same author, not more than 30 minutes ago, then update the last revision instead of
# creating a new one
if (revisions_size > 0) && continous_revision?(time, author)
current_revision.update_attributes(:content => content, :revised_at => time)
else
revisions.build(:content => content, :author => author, :revised_at => time)
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end
save
self
end
def rollback(revision_number, time, author_ip, renderer)
roll_back_revision = self.revisions[revision_number]
if roll_back_revision.nil?
raise Instiki::ValidationError.new("Revision #{revision_number} not found")
end
author = Author.new(roll_back_revision.author.name, author_ip)
revise(roll_back_revision.content, self.name, time, author, renderer)
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end
def revisions?
revisions.size > 1
end
def previous_revision(revision)
revision_index = revisions.each_with_index do |rev, index|
if rev.id == revision.id
break index
else
nil
end
end
if revision_index.nil? or revision_index == 0
nil
else
revisions[revision_index - 1]
end
end
def references
web.select.pages_that_reference(name)
end
def wiki_words
wiki_references.select { |ref| ref.wiki_word? }.map { |ref| ref.referenced_name }
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end
def categories
wiki_references.select { |ref| ref.category? }.map { |ref| ref.referenced_name }
end
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def linked_from
web.select.pages_that_link_to(name)
end
def redirects
wiki_references.select { |ref| ref.redirected_page? }.map { |ref| ref.referenced_name }
end
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def included_from
web.select.pages_that_include(name)
end
# Returns the original wiki-word name as separate words, so "MyPage" becomes "My Page".
def plain_name
web.brackets_only? ? name.escapeHTML.html_safe : WikiWords.separate(name).escapeHTML.html_safe
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end
LOCKING_PERIOD = 30.minutes
def lock(time, locked_by)
update_attributes(:locked_at => time, :locked_by => locked_by)
end
def lock_duration(time)
((time - locked_at) / 60).to_i unless locked_at.nil?
end
def unlock
update_attribute(:locked_at, nil)
end
def locked?(comparison_time)
locked_at + LOCKING_PERIOD > comparison_time unless locked_at.nil?
end
def to_param
name.as_utf8
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end
private
def continous_revision?(time, author)
(current_revision.author == author) && (revised_at + 30.minutes > time)
end
# Forward method calls to the current revision, so the page responds to all revision calls
def method_missing(method_id, *args, &block)
method_name = method_id.to_s
# Perform a hand-off to AR::Base#method_missing
if @attributes.include?(method_name) or md = /(=|\?|_before_type_cast)$/.match(method_name)
super(method_id, *args, &block)
else
current_revision.send(method_id)
end
end
end