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Contents
module DataMapper
class ContextualValidations
# This will be raised when you try to access
# a context that's not a member of the DEFAULT_CONTEXTS array.
class UnknownContextError < StandardError
end
# Add your custom contexts here.
DEFAULT_CONTEXTS = [
:general, :create, :save, :update
]
def initialize
@contexts = Hash.new { |h,k| h[k.to_sym] = [] }
end
# Retrieves a context by symbol.
# Raises an exception if the symbol isn't a member of DEFAULT_CONTEXTS.
# This isn't to keep you from adding your own contexts, it's just to
# prevent errors due to typos. When adding your own contexts just
# remember to add it to DEFAULT_CONTEXTS first.
def context(name)
raise UnknownContextError.new(name) unless DEFAULT_CONTEXTS.include?(name)
@contexts[name]
end
# Clear out all the currently defined validators.
# This makes testing easier.
def clear!
@contexts.clear
end
# Execute all validations against an instance for a specified context,
# including the "always-on" :general context.
def execute(context_name, target)
target.errors.clear!
validations = context(context_name)
validations += context(:general) unless context_name == :general
validations.inject(true) do |result, validator|
result & validator.call(target)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems