A small library for validating user input. It includes a mixin, Validatable, and two opinionated classes that include it: Form, and Field.
gem install preform
validate: Template command method that needs to be implemented. Runs to determine errors.
valid?: Query to see if any errors exist.
errors: Returns the errors hash.
merge_errors!: Given another validatable, merges errors into self's errors.
assert: Tests a value to see if an error should be added or not. Always returns a boolean so asserts can be nested.
after_initialize: Override to perform custom initialization behavior.
params: Raw params given to the form.
attributes: Hook that allows you to transform params for use in your application. By default returns raw params.
after_initialize: Override to perform custom initialization behavior.
key: Reader for the form key, used when merging errors into a form.
value: Raw value to validate.