+h4. Stricter collection manifest validation on the API server
+
+As a consequence of "#14482":https://dev.arvados.org/issues/14482, the Ruby SDK does a more rigorous collection manifest validation. Collections created after 2015-05 are unlikely to be invalid, however you may check for invalid manifests using the script below.
+
+You could set up a new rvm gemset and install the specific arvados gem for testing, like so:
+
+<notextile>
+<pre><code>~$ <span class="userinput">rvm gemset create rubysdk-test</span>
+~$ <span class="userinput">rvm gemset use rubysdk-test</span>
+~$ <span class="userinput">gem install arvados -v 1.3.1.20190301212059</span>
+</code></pre>
+</notextile>
+
+Next, you can run the following script using admin credentials, it will scan the whole collection database and report any collection that didn't pass the check:
+
+{% codeblock as ruby %}
+require 'arvados'
+require 'arvados/keep'
+
+api = Arvados.new
+offset = 0
+batch_size = 100
+invalid = []
+
+while true
+ begin
+ req = api.collection.index(
+ :select => [:uuid, :created_at, :manifest_text],
+ :include_trash => true, :include_old_versions => true,
+ :limit => batch_size, :offset => offset)
+ rescue
+ invalid.each {|c| puts "#{c[:uuid]} (Created at #{c[:created_at]}): #{c[:error]}" }
+ raise
+ end
+
+ req[:items].each do |col|
+ begin
+ Keep::Manifest.validate! col[:manifest_text]
+ rescue Exception => e
+ puts "Collection #{col[:uuid]} manifest not valid"
+ invalid << {uuid: col[:uuid], error: e, created_at: col[:created_at]}
+ end
+ end
+ puts "Checked #{offset} / #{req[:items_available]} - Invalid: #{invalid.size}"
+ offset += req[:limit]
+ break if offset > req[:items_available]
+end
+
+if invalid.empty?
+ puts "No invalid collection manifests found"
+else
+ invalid.each {|c| puts "#{c[:uuid]} (Created at #{c[:created_at]}): #{c[:error]}" }
+end
+{% endcodeblock %}
+
+The script will return a final report enumerating any invalid collection by UUID, with its creation date and error message so you can take the proper correction measures, if needed.
+
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