create method to determine if merge request already exists

[logicminds]

Currently there is no way to determine if a merge request already exists. We need a method called merge_request_exists? to find out if the request needs to be created or not.

Currently this is what I am doing in my own wrapper code.

 # merge_request fetches all the available merge requests with given state
  # this is supposed to work but the data being returned is not correct
  def merge_request(src,dst, email=author_email)
    merge_requests.find_all { |mr| mr.target_branch == dst and mr.source_branch == src and mr.author.email == email }

  end

  #retrives all the current merge requests with the state filtered
  def merge_requests(id=project_id, state='active')
    client.merge_requests(id).find_all {|mr| mr.state == state }
  end

[NARKOZ]

merge_request doesn't fetch all the available merge requests. See the docs.

Client only wraps the REST API provided by GitLab. Anything else is up to you.
Basically you need to get all merge requests for a project and then filter that array using ruby.