Return all the current content of this page into a `string`.

        This is used by the haystack framework to build the search index.

def expose_content(self):
        """Return all the current content of this page into a `string`.

        This is used by the haystack framework to build the search index."""
        placeholders = get_placeholders(self.get_template())
        exposed_content = []
        for lang in self.get_languages():
            for ctype in [p.name for p in placeholders]:
                content = self.get_content(lang, ctype, False)
                if content:
                    exposed_content.append(content)
        return u"\r\n".join(exposed_content)