def commit_user(githubuser, commituser)

      users = db[:users]

      name = commituser['name']
      email = commituser['email'] #if is_valid_email(commituser['email'])
      # Github user can be null when the commit email has not been associated
      # with any account in Github.
      login = githubuser['login'] unless githubuser.nil?

      # web-flow is a special user reserved for web-based commits:
      # https://api.github.com/users/web-flow
      # We do not follow the process below as this user's email
      # (noreply@github.com) clashes other existing users' emails.
      if login == 'web-flow'
        return ensure_user_byuname('web-flow')
      end

      return ensure_user("#{name}<#{email}>", false, false) if login.nil?

      dbuser = users.first(:login => login)
      byemail = users.first(:email => email)

      if dbuser.nil?
        # We do not have the user in the database yet
        added = ensure_user(login, false, false)

        # A commit user can be found by email but not
        # by the user name he used to commit. This probably means that the
        # user has probably changed his user name. Treat the user's by-email
        # description as valid.
        if added.nil? and not byemail.nil?
          warn "Found user #{byemail[:login]} with same email #{email} as non existing user #{login}. Assigning user #{login} to #{byemail[:login]}"
          return users.first(:login => byemail[:login])
        end

        # This means that the user's login has been associated with a
        # Github user by the time the commit was done (and hence Github was
        # able to associate the commit to an account), but afterwards the
        # user has deleted his account (before GHTorrent processed it).
        # On absense of something better to do, try to find the user by email
        # and return a "fake" user entry.
        if added.nil?
          warn "User account for user #{login} deleted from Github"
          return ensure_user("#{name}<#{email}>", false, false)
        end

        if byemail.nil?
          users.filter(:login => login).update(:name => name) if added[:name].nil?
          users.filter(:login => login).update(:email => email) if added[:email].nil?
        else
          # There is a previous entry for the user, currently identified by
          # email. This means that the user has updated his account and now
          # Github is able to associate his commits with his git credentials.
          # As the previous entry might have already associated records, just
          # delete the new one and update the existing with any extra data.
          users.filter(:login => login).delete
          users.filter(:email => email).update(
              :login => login,
              :company => added[:company],
              :location => added[:location],
              :created_at => added[:created_at]
          )
        end
      else
        users.filter(:login => login).update(:name => name) if dbuser[:name].nil?
        users.filter(:login => login).update(:email => email) if dbuser[:email].nil?
      end
      users.first(:login => login)

    end
def commit_user(githubuser, commituser)

      users = db[:users]

      name = commituser['name']
      email = commituser['email'] #if is_valid_email(commituser['email'])
      # Github user can be null when the commit email has not been associated
      # with any account in Github.
      login = githubuser['login'] unless githubuser.nil?

      # web-flow is a special user reserved for web-based commits:
      # https://api.github.com/users/web-flow
      # We do not follow the process below as this user's email
      # (noreply@github.com) clashes other existing users' emails.
      if login == 'web-flow'
        return ensure_user_byuname('web-flow')
      end

      return ensure_user("#{name}<#{email}>", false, false) if login.nil?

      dbuser = users.first(:login => login)
      byemail = users.first(:email => email)

      if dbuser.nil?
        # We do not have the user in the database yet
        added = ensure_user(login, false, false)

        # A commit user can be found by email but not
        # by the user name he used to commit. This probably means that the
        # user has probably changed his user name. Treat the user's by-email
        # description as valid.
        if added.nil? and not byemail.nil?
          warn "Found user #{byemail[:login]} with same email #{email} as non existing user #{login}. Assigning user #{login} to #{byemail[:login]}"
          return users.first(:login => byemail[:login])
        end

        # This means that the user's login has been associated with a
        # Github user by the time the commit was done (and hence Github was
        # able to associate the commit to an account), but afterwards the
        # user has deleted his account (before GHTorrent processed it).
        # On absense of something better to do, try to find the user by email
        # and return a "fake" user entry.
        if added.nil?
          warn "User account for user #{login} deleted from Github"
          return ensure_user("#{name}<#{email}>", false, false)
        end

        if byemail.nil?
          users.filter(:login => login).update(:name => name) if added[:name].nil?
          users.filter(:login => login).update(:email => email) if added[:email].nil?
        else
          # There is a previous entry for the user, currently identified by
          # email. This means that the user has updated his account and now
          # Github is able to associate his commits with his git credentials.
          # As the previous entry might have already associated records, just
          # delete the new one and update the existing with any extra data.
          users.filter(:login => login).delete
          users.filter(:email => email).update(
              :login => login,
              :company => added[:company],
              :location => added[:location],
              :created_at => added[:created_at]
          )
        end
      else
        users.filter(:login => login).update(:name => name) if dbuser[:name].nil?
        users.filter(:login => login).update(:email => email) if dbuser[:email].nil?
      end
      users.first(:login => login)

    end
Add (or update) an entry for a commit author. This method uses information
 in the JSON object returned by Github to add (or update) a user in the
 metadata database with a full user entry (both Git and Github details).

 ==Parameters:
 [githubuser]  A hash containing the user's Github login
 [commituser]  A hash containing the Git commit's user name and email
 == Returns:
 The (added/modified) user entry as a Hash.