Jason encoder question

Questions & Help Questions
1

Elixir newbie - I am sure I am reading the error incorrectly. Any pointers on this? The implemented protocols suggest that Jason.encode should be able to handle the term. But I get an error nevertheless. Before I massage the data into something else that Jason accepts, wanted to request pointers on how to read this error. I have a structure (stat, in the attached screen shot). i(stat) says it has implemented the Jason.Encoder protocol?

Any pointers would be deeply appreciated.

Screen Shot 2022-01-16 at 12.24.38 PM
Screen Shot 2022-01-16 at 12.24.38 PM680×391 57.3 KB

2

Please just copy the error message next time; it is very hare to read in a screen shot with not the greatest color scheme.

A list can be encoded, but a tuple cannot. You have a tuple as the first element of the list, so it still cannot be encoded. Jason can only encode the data structure if everything is encodable.

3

The data type of stat is a list, and Jason.Encoder is indeed implemented for lists. That doesn’t mean however that Jason.Encoder is implemented for any specific item of the list. Specifically, you have a list of tuples, and the Jason.Encoder protocol is not implemented by default for tuples.

4

Thank you. Will copy message as is next time. Sorry about that dumb question. I get the error.

5

Thanks for the quick reply. That was pretty dumb of me.

6

No worries, just part of learning!