discourse/app/models/post_revision.rb

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require_dependency "discourse_diff"
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class PostRevision < ActiveRecord::Base
belongs_to :post
belongs_to :user
serialize :modifications, Hash
def body_changes
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cooked_diff = DiscourseDiff.new(previous("cooked"), current("cooked"))
raw_diff = DiscourseDiff.new(previous("raw"), current("raw"))
{
inline: cooked_diff.inline_html,
side_by_side: cooked_diff.side_by_side_html,
side_by_side_markdown: raw_diff.side_by_side_markdown
}
end
def category_changes
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prev = previous("category_id")
cur = current("category_id")
return if prev == cur
{
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previous_category_id: prev,
current_category_id: cur,
}
end
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def wiki_changes
prev = lookup("wiki", 0)
cur = lookup("wiki", 1)
return if prev == cur
{
previous_wiki: prev,
current_wiki: cur,
}
end
def title_changes
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prev = "<div>#{CGI::escapeHTML(previous("title"))}</div>"
cur = "<div>#{CGI::escapeHTML(current("title"))}</div>"
return if prev == cur
diff = DiscourseDiff.new(prev, cur)
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{
inline: diff.inline_html,
side_by_side: diff.side_by_side_html
}
end
def user_changes
prev = previous("user_id")
cur = current("user_id")
return if prev == cur
{
previous_user: User.find_by(id: prev),
current_user: User.find_by(id: cur)
}
end
def previous(field)
lookup_with_fallback(field, 0)
end
def current(field)
lookup_with_fallback(field, 1)
end
def previous_revisions
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@previous_revs ||= PostRevision.where("post_id = ? AND number < ?", post_id, number)
.order("number desc")
.to_a
end
def has_topic_data?
post && post.post_number == 1
end
def lookup_with_fallback(field, index)
unless val = lookup(field, index)
previous_revisions.each do |v|
break if val = v.lookup(field, 1)
end
end
unless val
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if ["cooked", "raw"].include?(field)
val = post.send(field)
else
val = post.topic.send(field)
end
end
val
end
def lookup(field, index)
if mod = modifications[field]
mod[index]
end
end
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end
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# == Schema Information
#
# Table name: post_revisions
#
# id :integer not null, primary key
# user_id :integer
# post_id :integer
# modifications :text
# number :integer
# created_at :datetime
# updated_at :datetime
#
# Indexes
#
# index_post_revisions_on_post_id (post_id)
# index_post_revisions_on_post_id_and_number (post_id,number)
#