update screenshot references in evidence when nodes are merged

app/controllers/concerns/attachments_copier.rb

@@ -7,14 +7,16 @@ def copy_attachments(record)
 
       if attachment
         new_attachment = attachment.copy_to(record.node)
-        new_filename = new_attachment.url_encoded_filename
-        new_path = full_screenshot_path.gsub(
-          /nodes\/[0-9]+\/attachments\/.+/,
-          "nodes/#{new_attachment.node_id}/attachments/#{new_filename}"
-        )
-
-        record.content = record.content.gsub(full_screenshot_path, new_path)
+        record.content = updated_record_content(record.content, full_screenshot_path, new_attachment)
       end
     end
   end
+
+  def updated_record_content(record_content, full_screenshot_path, new_attachment)
+    new_path = full_screenshot_path.gsub(
+      /nodes\/[0-9]+\/attachments\/.+/,
+      "nodes/#{new_attachment.node_id}/attachments/#{new_attachment.url_encoded_filename}"
+    )
+    record_content.gsub(full_screenshot_path, new_path)
+  end
 end

app/services/nodes/merger.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Nodes::Merger
+  include AttachmentsCopier
+
   def self.call(target_node, source_node)
     new(target_node, source_node).call
   end
@@ -90,15 +92,33 @@ def update_properties
   end
 
   def copy_attachments
-    self.copied_attachments = []
+    self.copied_attachments = {}
 
     source_node.attachments.each do |attachment|
-      copied_attachments << attachment.copy_to(target_node)
+      new_attachment = attachment.copy_to(target_node)
+      copied_attachments[attachment.filename] = new_attachment
+    end
+    update_attachment_references
+  end
+
+  def update_attachment_references
+    target_node.evidence_ids.each do |evidence_id|
+      evidence = Evidence.find(evidence_id)
+      evidence.content.scan(Attachment::SCREENSHOT_REGEX).each do |screenshot_path|
+        full_screenshot_path, _, _, _, _, node_id, original_filename, _ = screenshot_path
+        # skip if the attachment already references the new node
+        next if node_id == target_node.id
+
+        new_attachment = copied_attachments[original_filename]
+        new_content = updated_record_content(evidence.content, full_screenshot_path, new_attachment)
+
+        evidence.update_attribute('content', new_content)
+      end
     end
   end
 
   def undo_attachments_copy
     return unless copied_attachments&.any?
-    copied_attachments.each(&:delete)
+    copied_attachments.values.each(&:delete)
   end
 end

spec/services/nodes/merger_spec.rb

@@ -80,6 +80,22 @@
       FileUtils.rm_rf(Dir.glob(Attachment.pwd + '*'))
     end
 
+    it 'updates evidence screenshot links to point to new node' do
+      attachment = create(:attachment, node: source_node)
+      evidence = create(:evidence,
+        content: "#[Description]#\n\n!/pro/projects/#{source_node.project_id}/nodes/#{source_node.id}/attachments/#{attachment.url_encoded_filename}!",
+        node: source_node
+      )
+      merge_nodes
+
+      expect(evidence.reload.content)
+        .to include("/nodes/#{target_node.id}/attachments/#{attachment.url_encoded_filename}")
+      expect(evidence.reload.content)
+        .not_to include("/nodes/#{source_node.id}/attachments/#{attachment.url_encoded_filename}")
+
+      FileUtils.rm_rf(Dir.glob(Attachment.pwd + '*'))
+    end
+
     describe 'property merges' do
       it 'merges basic properties together' do
         source_node = create(:node, :with_properties)
@@ -223,6 +239,20 @@
 
         FileUtils.rm_rf(Dir.glob(Attachment.pwd + '*'))
       end
+
+      it 'does not update evidence screenshot links to point to new node' do
+        attachment = create(:attachment, node: source_node)
+        evidence = create(:evidence,
+          content: "#[Description]#\n\n!/pro/projects/#{source_node.project_id}/nodes/#{source_node.id}/attachments/#{attachment.url_encoded_filename}!",
+          node: source_node
+        )
+        merge_nodes
+
+        expect(evidence.content).to include("/nodes/#{source_node.id}/attachments/#{attachment.url_encoded_filename}")
+        expect(evidence.content).not_to include("/nodes/#{target_node.id}/attachments/#{attachment.url_encoded_filename}")
+
+        FileUtils.rm_rf(Dir.glob(Attachment.pwd + '*'))
+      end
     end
   end
 end