discourse/app/serializers/post_revision_serializer.rb

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class PostRevisionSerializer < ApplicationSerializer
attributes :created_at,
:post_id,
# which revision is hidden
:previous_hidden,
:current_hidden,
# dynamic & based on the current scope
:first_revision,
:previous_revision,
:current_revision,
:next_revision,
:last_revision,
# used for display
:current_version,
:version_count,
# from the user
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:username,
:display_username,
:avatar_template,
# all the changes
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:edit_reason,
:body_changes,
:title_changes,
:user_changes,
:tags_changes,
:wiki,
:can_edit
# Creates a field called field_name_changes with previous and
# current members if a field has changed in this revision
def self.add_compared_field(field)
changes_name = "#{field}_changes".to_sym
self.attributes changes_name
define_method(changes_name) do
{ previous: previous[field], current: current[field] }
end
define_method("include_#{changes_name}?") do
previous[field] != current[field]
end
end
add_compared_field :wiki
def previous_hidden
previous["hidden"]
end
def current_hidden
current["hidden"]
end
def first_revision
revisions.first["revision"]
end
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def previous_revision
@previous_revision ||= revisions.select { |r| r["revision"] >= first_revision }
.select { |r| r["revision"] < current_revision }
.last.try(:[], "revision")
end
def current_revision
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object.number
end
def next_revision
@next_revision ||= revisions.select { |r| r["revision"] <= last_revision }
.select { |r| r["revision"] > current_revision }
.first.try(:[], "revision")
end
def last_revision
@last_revision ||= revisions.select { |r| r["revision"] <= post.version }.last["revision"]
end
def current_version
@current_version ||= revisions.select { |r| r["revision"] <= current_revision }.count + 1
end
def version_count
revisions.count
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end
def username
user.username_lower
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end
def display_username
user.username
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end
def avatar_template
user.avatar_template
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end
def wiki
object.post.wiki
end
def can_edit
scope.can_edit?(object.post)
end
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def edit_reason
# only show 'edit_reason' when revisions are consecutive
current["edit_reason"] if scope.can_view_hidden_post_revisions? ||
current["revision"] == previous["revision"] + 1
end
def body_changes
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 title_changes
prev = "<div>#{previous["title"] && CGI::escapeHTML(previous["title"])}</div>"
cur = "<div>#{current["title"] && CGI::escapeHTML(current["title"])}</div>"
# always show the title for post_number == 1
return if object.post.post_number > 1 && prev == cur
diff = DiscourseDiff.new(prev, cur)
{
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
# if stuff is messed up, default to system
previous = User.find_by(id: prev) || Discourse.system_user
current = User.find_by(id: cur) || Discourse.system_user
{
previous: {
username: previous.username_lower,
display_username: previous.username,
avatar_template: previous.avatar_template
},
current: {
username: current.username_lower,
display_username: current.username,
avatar_template: current.avatar_template
}
}
end
def tags_changes
{ previous: previous["tags"], current: current["tags"] }
end
def include_tags_changes?
SiteSetting.tagging_enabled && previous["tags"] != current["tags"]
end
protected
def post
@post ||= object.post
end
def topic
@topic ||= object.post.topic
end
def revisions
@revisions ||= all_revisions.select { |r| scope.can_view_hidden_post_revisions? || !r["hidden"] }
end
def all_revisions
return @all_revisions if @all_revisions
post_revisions = PostRevision.where(post_id: object.post_id).order(:number).to_a
latest_modifications = {
"raw" => [post.raw],
"cooked" => [post.cooked],
"edit_reason" => [post.edit_reason],
"wiki" => [post.wiki],
"post_type" => [post.post_type],
"user_id" => [post.user_id]
}
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# Retrieve any `tracked_topic_fields`
PostRevisor.tracked_topic_fields.each_key do |field|
if topic.respond_to?(field)
latest_modifications[field.to_s] = [topic.send(field)]
end
end
if SiteSetting.topic_featured_link_enabled
latest_modifications["featured_link"] = [post.topic.featured_link]
end
if SiteSetting.tagging_enabled
latest_modifications["tags"] = [post.topic.tags.map(&:name)]
end
post_revisions << PostRevision.new(
number: post_revisions.last.number + 1,
hidden: post.hidden,
modifications: latest_modifications
)
@all_revisions = []
# backtrack
post_revisions.each do |pr|
revision = HashWithIndifferentAccess.new
revision[:revision] = pr.number
revision[:hidden] = pr.hidden
pr.modifications.each_key do |field|
revision[field] = pr.modifications[field][0]
end
@all_revisions << revision
end
# waterfall
(@all_revisions.count - 1).downto(1).each do |r|
cur = @all_revisions[r]
prev = @all_revisions[r - 1]
cur.each_key do |field|
prev[field] = prev.has_key?(field) ? prev[field] : cur[field]
end
end
@all_revisions
end
def previous
@previous ||= revisions.select { |r| r["revision"] <= current_revision }.last
end
def current
@current ||= revisions.select { |r| r["revision"] > current_revision }.first
end
def user
# if stuff goes pear shape attribute to system
object.user || Discourse.system_user
end
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end