[DTACLOUD-515] Make CIMI schema errors nicer

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: CIMI/Frontend
• Assignee: Unassigned
• Reporter: Michal Fojtik
• Created: 18/Mar/13 09:23
• Updated: 18/Mar/13 09:23

Description

It is sometimes very difficult to debug/investigate the CIMI schema errors like this:

E, 2013-03-15T22:38:41.085818 #15400 ERROR – 500: [NoMethodError] undefined method `[]' for nil:NilClass

d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:285:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `each'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:150:in `convert_to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:127:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `each'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:150:in `convert_to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `map'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `each'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:150:in `convert_to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `map'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:256:in `to_xml'
d:/sources/OSS/cloud/deltacloud/server/lib/cimi/models/schema.rb:390:in `to_xml'

127.0.0.1 - - [15/Mar/2013 22:38:41] "GET /cimi/system_templates?format=xml HTTP/1.1" 500 118321 58.3752

My idea is to provide more nice errors to developers so it will be easier to figure out what is wrong.
In this case, it would help to print what attribute in the SystemTemplate schema errors out, like:

[CIMISchemaError] The SystemTemplate#properties attribute value must be a Hash
[CIMISchemaError] The SystemTemplate#machine_template attribute value must be a Reference to MachineTemplate

etc.