FIX: topic and category exporters were only exporting users who created the first post

lib/import_export/base_exporter.rb

@@ -75,10 +75,10 @@ module ImportExport
       end
 
       user_ids.uniq!
-      return [] if user_ids.empty?
+      return User.none if user_ids.empty?
 
       users = User.where(id: user_ids)
-      export_users(users.to_a)
+      export_users(users)
     end
 
     def export_group_users!
@@ -118,10 +118,9 @@ module ImportExport
       return if @export_data[:topics].blank?
       topic_ids = @export_data[:topics].pluck(:id)
 
-      users = User.joins(:topics).where('topics.id IN (?)', topic_ids).to_a
-      users.uniq!
+      users = User.joins(:posts).where('posts.topic_id IN (?)', topic_ids).distinct
 
-      export_users(users.to_a)
+      export_users(users)
     end
 
     def export_topic_users!
@@ -132,9 +131,9 @@ module ImportExport
 
     def export_users(users)
       data = []
-      users.reject! { |u| u.id == Discourse::SYSTEM_USER_ID }
 
-      users.each do |u|
+      users.find_each do |u|
+        next if u.id == Discourse::SYSTEM_USER_ID
         x = USER_ATTRS.inject({}) { |h, a| h[a] = u.send(a); h; }
         x.merge(bio_raw: u.user_profile.bio_raw,
                 website: u.user_profile.website,

spec/import_export/category_exporter_spec.rb

@@ -6,6 +6,8 @@ describe ImportExport::CategoryExporter do
   let(:category) { Fabricate(:category) }
   let(:group) { Fabricate(:group) }
   let(:user) { Fabricate(:user) }
+  let(:user2) { Fabricate(:user) }
+  let(:user3) { Fabricate(:user) }
 
   before do
     STDOUT.stubs(:write)
@@ -38,13 +40,17 @@ describe ImportExport::CategoryExporter do
 
     it 'export the category with topics and users' do
       topic1 = Fabricate(:topic, category: category, user_id: -1)
+      Fabricate(:post, topic: topic1, user: User.find(-1), post_number: 1)
       topic2 = Fabricate(:topic, category: category, user: user)
+      Fabricate(:post, topic: topic2, user: user, post_number: 1)
+      reply1 = Fabricate(:post, topic: topic2, user: user2, post_number: 2)
+      reply2 = Fabricate(:post, topic: topic2, user: user3, post_number: 3)
       data = ImportExport::CategoryExporter.new([category.id]).perform.export_data
 
       expect(data[:categories].count).to eq(1)
       expect(data[:groups].count).to eq(0)
       expect(data[:topics].count).to eq(2)
-      expect(data[:users].count).to eq(1)
+      expect(data[:users].map { |u| u[:id] }).to match_array([user.id, user2.id, user3.id])
     end
   end
 

spec/import_export/topic_exporter_spec.rb

@@ -9,6 +9,7 @@ describe ImportExport::TopicExporter do
 
   let(:user) { Fabricate(:user) }
   let(:topic) { Fabricate(:topic, user: user) }
+  let!(:post) { Fabricate(:post, topic: topic, user: user) }
 
   context '.perform' do
     it 'export a single topic' do
@@ -22,12 +23,13 @@ describe ImportExport::TopicExporter do
 
     it 'export multiple topics' do
       topic2 = Fabricate(:topic, user: user)
+      post2 = Fabricate(:post, user: user, topic: topic2)
       data = ImportExport::TopicExporter.new([topic.id, topic2.id]).perform.export_data
 
       expect(data[:categories].blank?).to eq(true)
       expect(data[:groups].blank?).to eq(true)
       expect(data[:topics].count).to eq(2)
-      expect(data[:users].count).to eq(1)
+      expect(data[:users].map { |u| u[:id] }).to match_array([user.id])
     end
   end