instiki/app/models/revision.rb

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require 'diff'
class Revision < ActiveRecord::Base
belongs_to :page
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composed_of :author, :mapping => [ %w(author name), %w(ip ip) ]
def created_on
created_at.to_date
end
def pretty_created_at
# Must use DateTime because Time doesn't support %e on at least some platforms
DateTime.new(
created_at.year, created_at.mon, created_at.day, created_at.hour, created_at.min
).strftime "%B %e, %Y %H:%M"
end
# todo: drop next_revision, previuous_revision and number from here - unused code
def next_revision
Revision.find_by_number_and_page_id(number+1, page_id)
end
def previous_revision
@previous_revions ||= number > 0 ? Revision.find_by_number_and_page_id(number-1, page_id) : nil
end
# Returns an array of all the WikiIncludes present in the content of this revision.
def wiki_includes
unless @wiki_includes_cache
chunks = display_content.find_chunks(Include)
@wiki_includes_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_includes_cache
end
# Returns an array of all the WikiReferences present in the content of this revision.
def wiki_references
unless @wiki_references_cache
chunks = display_content.find_chunks(WikiChunk::WikiReference)
@wiki_references_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_references_cache
end
# Returns an array of all the WikiWords present in the content of this revision.
def wiki_words
unless @wiki_words_cache
wiki_chunks = display_content.find_chunks(WikiChunk::WikiLink)
@wiki_words_cache = wiki_chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_words_cache
end
# Returns an array of all the WikiWords present in the content of this revision.
# that already exists as a page in the web.
def existing_pages
wiki_words.select { |wiki_word| page.web.page(wiki_word) }
end
# Returns an array of all the WikiWords present in the content of this revision
# that *doesn't* already exists as a page in the web.
def unexisting_pages
wiki_words - existing_pages
end
# Explicit check for new type of display cache with chunks_by_type method.
# Ensures new version works with older snapshots.
def display_content
unless @display_cache && @display_cache.respond_to?(:chunks_by_type)
@display_cache = WikiContent.new(self)
@display_cache.render!
end
@display_cache
end
def display_diff
previous_revision ? HTMLDiff.diff(previous_revision.display_content, display_content) : display_content
end
def clear_display_cache
@wiki_words_cache = @published_cache = @display_cache = @wiki_includes_cache =
@wiki_references_cache = nil
end
def display_published
unless @published_cache && @published_cache.respond_to?(:chunks_by_type)
@published_cache = WikiContent.new(self, {:mode => :publish})
@published_cache.render!
end
@published_cache
end
def display_content_for_export
WikiContent.new(self, {:mode => :export} ).render!
end
def force_rendering
begin
display_content.render!
rescue => e
logger.error "Failed rendering page #{@name}"
logger.error e
message = e.message
# substitute content with an error message
self.content = <<-EOL
<p>Markup engine has failed to render this page, raising the following error:</p>
<p>#{message}</p>
<pre>#{self.content}</pre>
EOL
clear_display_cache
raise e
end
end
protected
before_create :set_revision_number, :set_timestamp
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after_create :force_rendering
after_save :clear_display_cache
# TODO Refactor this away. Revisions collection should not rely on the revision number for
# sorting etc - revisions must be easy to delete (this helps fighting wiki spam)
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def set_revision_number
self.number = self.class.count(['page_id = ?', page_id]) + 1
end
def set_timestamp
self.timestamp = (Time.now.to_f * 1000).to_i.to_s
end
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end