refresh_blueprint {hardhat}

Refresh a preprocessing blueprint

Description

refresh_blueprint() is a developer facing generic function that is called at the end of update_blueprint(). It simply is a wrapper around the method specific ⁠new_*_blueprint()⁠ function that runs the updated blueprint through the constructor again to ensure that all of the elements of the blueprint are still valid after the update.

Usage

refresh_blueprint(blueprint)

Arguments

blueprint

A preprocessing blueprint.

Details

If you implement your own custom blueprint, you should export a refresh_blueprint() method that just calls the constructor for your blueprint and passes through all of the elements of the blueprint to the constructor.

Value

blueprint is returned after a call to the corresponding constructor.

Examples

blueprint <- default_xy_blueprint()

# This should never be done manually, but is essentially
# what `update_blueprint(blueprint, intercept = TRUE)` does for you
blueprint$intercept <- TRUE

# Then update_blueprint() will call refresh_blueprint()
# to ensure that the structure is correct
refresh_blueprint(blueprint)

# So you can't do something like...
blueprint_bad <- blueprint
blueprint_bad$intercept <- 1

# ...because the constructor will catch it
try(refresh_blueprint(blueprint_bad))

# And update_blueprint() catches this automatically
try(update_blueprint(blueprint, intercept = 1))