Creates multiple statement entries.

def create_many(self, statements):
        """
        Creates multiple statement entries.
        """
        Statement = self.get_model('statement')
        Tag = self.get_model('tag')

        session = self.Session()

        create_statements = []
        create_tags = {}

        for statement in statements:

            statement_data = statement.serialize()
            tag_data = statement_data.pop('tags', [])

            statement_model_object = Statement(**statement_data)

            if not statement.search_text:
                statement_model_object.search_text = self.tagger.get_bigram_pair_string(statement.text)

            if not statement.search_in_response_to and statement.in_response_to:
                statement_model_object.search_in_response_to = self.tagger.get_bigram_pair_string(statement.in_response_to)

            new_tags = set(tag_data) - set(create_tags.keys())

            if new_tags:
                existing_tags = session.query(Tag).filter(
                    Tag.name.in_(new_tags)
                )

                for existing_tag in existing_tags:
                    create_tags[existing_tag.name] = existing_tag

            for tag_name in tag_data:
                if tag_name in create_tags:
                    tag = create_tags[tag_name]
                else:
                    # Create the tag if it does not exist
                    tag = Tag(name=tag_name)

                    create_tags[tag_name] = tag

                statement_model_object.tags.append(tag)
            create_statements.append(statement_model_object)

        session.add_all(create_statements)
        session.commit()