How to use the lektor.types.Type.to_json function in Lektor

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        if self.source.has_choices:
            rv['choices'] = list(self.source.iter_choices(pad, record, alt))
        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        rv['addon_label_i18n'] = get_i18n_block(
            self.options, 'addon_label') or None
        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        rv['addon_label_i18n'] = get_i18n_block(
            self.options, 'addon_label') or None
        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)

        rv['flowblocks'] = discover_relevant_flowblock_models(
            self, pad, record, alt)

        block_order = self.flow_blocks
        if block_order is None:
            block_order = [k for k, v in sorted(pad.db.flowblocks.items(),
                                                key=lambda x: x[1].order)]
        rv['flowblock_order'] = block_order

        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)

        rv['flowblocks'] = discover_relevant_flowblock_models(
            self, pad, record, alt)

        block_order = self.flow_blocks
        if block_order is None:
            block_order = [k for k, v in sorted(iteritems(pad.db.flowblocks),
                                                key=lambda x: x[1].order)]
        rv['flowblock_order'] = block_order

        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        rv['checkbox_label_i18n'] = get_i18n_block(
            self.options, 'checkbox_label')
        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        rv['addon_label_i18n'] = get_i18n_block(
            self.options, 'addon_label') or None
        return rv

def to_json(self, pad, record=None, alt=PRIMARY_ALT):
        rv = Type.to_json(self, pad, record, alt)
        rv['is_fake_type'] = True
        return rv