On 02/11/2016 01:46 PM, immerrr again wrote:
Hi everyone Say, I'm writing an API and I want to add a JsonDict TypeDecorator, just like in the example provided in the documentation [1]. MySQL database has a restriction on the size of BLOB columns and would complain if I try to write a bigger value to it. I want to validate the user input before sending it to the DB, so that the user of the API can learn which field exceeded the length limitation and fix it. Is there a way to report the name of the parameter in the exception thrown from process_bind_parameter? 1. http://docs.sqlalchemy.org/en/latest/core/custom_types.html#marshal-json-strings
not currently, no. For the exception raised from within bind_processor to have this information directly an across-the-board change to the TypeEngine API would need to be made, which would break all third party dialects, unless we add in a new method, deprecate the old one, and generally go crazy with it.
A better option is to enhance the callpoint at which the bind processor is invoked to augment an exception with contextual information about the key.
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