gistfile1.rbx

activerecord.errors.models.content.attributes.topic.invalid 
activerecord.errors.models.content.invalid 
activerecord.errors.messages.invalid 

# with STI
activerecord.errors.models.post.attributes.topic.invalid    # Topic is invalid for post
activerecord.errors.models.post.invalid                     # Post is invalid
activerecord.errors.models.content.attributes.topic.invalid # Topic is invalid for content
activerecord.errors.models.content.invalid                  # Content is invalid
activerecord.errors.messages.invalid                        # This is invalid

# with custom message
activerecord.errors.models.content.attributes.topic.custom_invalid 
activerecord.errors.models.content.custom_invalid 
activerecord.errors.messages.custom_invalid 
activerecord.errors.messages.invalid 

# with custom message with STI
activerecord.errors.models.post.attributes.topic.custom_invalid 
activerecord.errors.models.post.custom_invalid 
activerecord.errors.models.content.attributes.topic.custom_invalid 
activerecord.errors.models.content.custom_invalid 
activerecord.errors.messages.custom_invalid 
activerecord.errors.messages.invalid 

# with custom message with STI and default_key
activerecord.errors.models.post.attributes.topic.custom_invalid 
activerecord.errors.models.post.custom_invalid 
activerecord.errors.models.content.attributes.topic.custom_invalid 
activerecord.errors.models.content.custom_invalid 
activerecord.errors.messages.custom_invalid 
activerecord.errors.messages.default_key
activerecord.errors.messages.invalid