3. Every order is recorded

Trax has recorded every run of PlaceOrder since chapter 1, but in memory, so the record went with the process. In this chapter we move it to Postgres and then give it something worth reading: payments that fail. By the end, a declined card or a provider that does not answer stops the order, gives its stock back, and leaves a row that says which junction failed, why, and whether trying again could help. The receipt link the provider hands back is kept out of every copy Trax writes.

This chapter starts from the end of chapter 2.

In this chapter

Start Postgres
Packages
Record runs in Postgres
Watch it fail
Read the runs back
Test it

SDK Reference

UsePostgres | SaveTrainParameters | AddJunctionLogger | TraxSensitive | IFailureClassifier | Metadata

Next: 3.1 Start Postgres