I solved this problem in my case by overriding Time.now during the import. This ist more like a workaround and maybe it'd be more appropriate to disable the ActiveRecord timestamps at all during import and set created_on and updated_on attributes manually (but since I'm not very familiar with the Redmine models and the acts_as_versioned plugin, I had problems doing so and did this hack to be able to import my project into Redmine without losing the changelog timestamps)

I also added a comment and set the author to nil for the automatic page edit that is done for each completely imported page (where the wiki syntax of Trac is converted to Redmine)

<pre>Index: lib/tasks/migrate_from_trac.rake
===================================================================
--- lib/tasks/migrate_from_trac.rake (revision 1291)
+++ lib/tasks/migrate_from_trac.rake (working copy)
@@ -69,6 +69,21 @@
'developer' => developer_role
}

+ class ::Time
+ class << self
+ alias :real_now :now
+ def now
+ real_now - @fake_diff.to_i
+ end
+ def fake (time)
+ @fake_diff = real_now - time
+ res = yield
+ @fake_diff = 0
+ res
+ end
+ end
+ end
+
class TracComponent < ActiveRecord::Base
set_table_name :component
end
@@ -345,14 +360,14 @@
i.tracker = TRACKER_MAPPING[ticket.ticket_type] || DEFAULT_TRACKER
i.custom_values << CustomValue.new(:custom_field => custom_field_map['resolution'], :value => ticket.resolution) unless ticket.resolution.blank?
i.id = ticket.id unless Issue.exists?(ticket.id)
- next unless i.save
+ next unless Time.fake(ticket.time) { i.save }
TICKET_MAP[ticket.id] = i.id
migrated_tickets += 1

# Owner
unless ticket.owner.blank?
i.assigned_to = find_or_create_user(ticket.owner, true)
- i.save
+ Time.fake(ticket.time) { i.save }
end

# Comments and status/resolution changes
@@ -380,7 +395,7 @@
:old_value => resolution_change.oldvalue,
:value => resolution_change.newvalue)
end
- n.save unless n.details.empty? && n.notes.blank?
+ Time.fake(time) { n.save } unless n.details.empty? && n.notes.blank?
end

# Attachments
@@ -390,7 +405,7 @@
a.file = attachment
a.author = find_or_create_user(attachment.author)
a.container = i
- migrated_ticket_attachments += 1 if a.save
+ migrated_ticket_attachments += 1 if Time.fake(attachment.time) { a.save }
end

# Custom fields
@@ -426,7 +441,7 @@
p.content.text = page.text
p.content.author = find_or_create_user(page.author) unless page.author.blank? || page.author == 'trac'
p.content.comments = page.comment
- p.new_record? ? p.save : p.content.save
+ Time.fake(page.time) { p.new_record? ? p.save : p.content.save }

next if p.content.new_record?
migrated_wiki_edits += 1
@@ -439,13 +454,15 @@
a.file = attachment
a.author = find_or_create_user(attachment.author)
a.container = p
- migrated_wiki_attachments += 1 if a.save
+ migrated_wiki_attachments += 1 if Time.fake(attachment.time) { a.save }
end
end

wiki.reload
wiki.pages.each do |page|
page.content.text = convert_wiki_text(page.content.text)
+ page.content.author = nil
+ page.content.comments = 'Migration to Redmine'
page.content.save
end
end
</pre>

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Committed in r1302 with slight changes (eg. use ticket changetime instead of time since Time.fake is used to properly set updated_on properties).
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