Typically the data that is passed into a teal
application is available before the app is run.
However, this is not always true and in some cases the data will be built only after the app has started.
A good example is pulling the data from an external repository, like a database, or uploading a file.
Additional authentication may be required.
teal_data_module
Preprocessing actions can be performed in-app using the teal_data_module
.
Rather than passing a teal_data
object to the app, one may pass a shiny
module that returns a teal_data
object (wrapped in a reactive expression).
This allows the app developer to include user actions data creation, fetching, and even pre-filtering modification.
A complete explanation of using the teal_data_module
can be found in this teal
vignette
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