[%
    SET error_message = {
        # messages for missing fields
        missing => {
            match_type                  => 'MISSING_SEARCH_MATCH_TYPE',
            search_terms                => 'MISSING_SEARCH_TERMS',

            moon_stick                  => 'I demand the MOON! On a STICK!',
        },

        # messages for invalid fields (failed constraints)
        invalid => {
            # reCAPTCHA messages (from: http://recaptcha.net/apidocs/captcha/)
            'incorrect-captcha-sol'     => 'the CAPTCHA solution was incorrect',
            'recaptcha-not-reachable'   => 'unable to contact the reCAPTCHA verify server',
        },

        # mappings from field names to something we'd like to show the user
        name => {
            email_address               => 'Email Address',
        },
    }
%]