code: def get_pull_request_query(self, queries, repository_id, project=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if repository_id is not None:
              route_values['repositoryId'] = self._serialize.url('repository_id', repository_id, 'str')
          content = self._serialize.body(queries, 'GitPullRequestQuery')
          response = self._send(http_method='POST',
                                location_id='b3a6eebe-9cf0-49ea-b6cb-1a4c5f5007b0',
                                version='5.1-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('GitPullRequestQuery', response)
docs: GetPullRequestQuery.
          [Preview API] This API is used to find what pull requests are related to a given commit.  It can be used to either find the pull request that created a particular merge commit or it can be used to find all pull requests that have ever merged a particular commit.  The input is a list of queries which each contain a list of commits. For each commit that you search against, you will get back a dictionary of commit -> pull requests.
          :param :class:`<GitPullRequestQuery> <azure.devops.v5_1.git.models.GitPullRequestQuery>` queries: The list of queries to perform.
          :param str repository_id: ID of the repository.
          :param str project: Project ID or project name
          :rtype: :class:`<GitPullRequestQuery> <azure.devops.v5_1.git.models.GitPullRequestQuery>`