An action to calculate aspect ratios.

app/actions/calculate_aspect_ratios.rb

@@ -0,0 +1,53 @@
+require File.join(File.dirname(__FILE__), 'support', 'document_action')
+
+class CalculateAspectRatios < DocumentAction
+
+  def process
+    errors = []
+    document = Document.find(input)
+    @page_aspect_ratios = (1..document.page_count).map do |page_number|
+      path = document.page_image_path(page_number, 'small')
+      filename = File.basename(path)
+      begin
+        File.open(filename, 'wb'){ |file| file << asset_store.read(path) }
+        cmd = %(gm identify #{filename} | egrep -o "[[:digit:]]+x[[:digit:]]+")
+        width, height = `#{cmd}`.split("x").map(&:to_f)
+        width / height
+      rescue Exception => e
+        params = options.merge({page_number: page_number})
+        errors.push(params)
+        LifecycleMailer.exception_notification(e,params).deliver_now
+        0
+      end
+    end
+
+    save_page_aspect_ratios!
+    errors
+  end
+
+  def save_page_aspect_ratios!
+    ids = document.pages.order(:page_number).pluck(:id)
+
+    query_template = <<-QUERY
+    UPDATE pages 
+      SET aspect_ratio = input.aspect_ratio
+      FROM (SELECT unnest(ARRAY[?]) as id, unnest(ARRAY[?]) as aspect_ratio) AS input
+      WHERE pages.id = input.id
+    QUERY
+    query = Page.send(:replace_bind_variables, query_template, [ids, @page_aspect_ratios])
+    Page.connection.execute(query)
+  end
+
+end
+
+__END__
+operator = Account.lookup(email)
+Document.find_each do |document|
+  job = document.processing_jobs.new( 
+    action: 'calculate_aspect_ratios', 
+    title: 'calculate_aspect_ratios', 
+    options: {id: document.id},
+    account_id: operator.id
+  )
+  job.queue
+end

config/cloud_crowd/express/config.yml

@@ -6,6 +6,7 @@
   - api_document_import
   - large_document_import
   - reindex_everything
+  - calculate_aspect_ratios
 
 # The following settings allow you to control the number of workers that can run
 # on a given node, to prevent the node from becoming overloaded. 'max_workers'

config/cloud_crowd/production/config.yml

@@ -6,6 +6,7 @@
   - backup_database
   - api_document_import
   - reindex_everything
+  - calculate_aspect_ratios
 
 # The following settings allow you to control the number of workers that can run
 # on a given node, to prevent the node from becoming overloaded. 'max_workers'