Extension to enhance `should have` on AR Model instances. Calls model.valid? in order to prepare the object's errors object. Accepts a :context option to specify the validation context.
You can also use this to specify the content of the error messages.
@example
model.should have(:no).errors_on(:attribute) model.should have(1).error_on(:attribute) model.should have(n).errors_on(:attribute) model.should have(n).errors_on(:attribute, :context => :create) model.errors_on(:attribute).should include("can't be blank")
# File lib/rspec/rails/extensions/active_record/base.rb, line 42 def errors_on(attribute, options = {}) self.valid?(options[:context]) [self.errors[attribute]].flatten.compact end