Developing Snaps
Discuss how to build custom Snaps.
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JTest and delayed Property evaluation expressions

I have a pretty simple snap that takes an input payload and performs an operation the payload, starting at a node specified using a “mapping root” property exactly like the Mapper snap. The snap works fine when testing it manually in the UI. I am tr...

Why does the Account connect() method return a string?

I thought I understood the custom Account connect method when using a ValidatableAccount returned a string to display to the user if/when the connect() method succeeds. However, my testing shows me that I can return any string I want and it is NEVER...

Schema Provider exception best practices

In my custom snaps, I am driving schema creation off a knowledge base rather than encoding the schema knowledge into the Snaps themselves. As a result, it is possible that I encounter an error condition when constructing an input or output schema. ...

Building snaps to handle custom array mapping

@ptaylor I need to build a snap that offers similar capabilities like those in the Mapping snap but I can’t quite figure out how to do it from the developer documentation provided. There are lots of methods on the PropertyBuilder object that are not ...

Back propagation of schemas

I have written custom snaps that advertise their input and output schemas. If I place a mapper directly prior to one of my snaps, the mapper picks up and shows the schema, just as I would expect it to. If I had to write another custom snap (let’s ca...

Iterative Development and static method caching?

I am building a relatively complex custom snap. As part of the snappack, I am bundling some helper classes that contain only static methods. I am seeing weirdness as I make changes and redeploy my snap. The problem is that the configure() method i...

Custom Account Section heading?

How do I create a section heading on the Account Creation/Edit Page like the “Cross-Account IAM Role” heading on the S3 Account class associated with the S3 File Reader/Writer?