How to hide a Fivestar field in a comment when the user didn't vote?

Question

The comments on my articles have a Fivestar field called 'Stars', but rating nodes isn't always required (see: How to hide rating field when adding comment to own node?). When the user didn't rate the node on which he/she is reacting, 0 stars (not saved in the database) are now being displayed in his/her comment, but I don't really like that.

How can I hide the stars when the user didn't vote?

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Edit: I'm trying to find a workaround with flags. I've created a flag called 'Reaction on own' and a rule that flags a comment when the comment's author equals the author of the commented node. In my case, it's sufficient that the 'Stars' field isn't displayed when a comment is flagged with 'Reaction on own'. This is the code of my custom module:

function hiderating_comment_view($comment) {
  $flag = flag_get_flag('reaction_on_own');
  if ($flag->is_flagged($comment->cid)){
    unset($comment->field_stars);
  }
}

Unfortunately, this isn't working. What's going wrong?

---

Note: In fact, the edit above isn't entirely true in my case, because 'zero' stars appear when a user reacts on his/her article or when the user has commented before. I've provided an answer for both cases.

Answer 1

You could try an approach like this (untested) but may work

/**
 * Implements hook_comment_view
 */
function hiderating_comment_view($comment) {
  if($flag = flag_get_flag('reaction_on_own')){
    // Debug comment to find field to hide, check dblog / watchdog
    debug($comment);
    if (!$flag->is_flagged($comment->cid)){
      unset($comment->field_stars);
    }
  }
}

Answer 2

I'm excited to announce that I finally found a working solution! It turned out to be a bit more difficult than I had assumed in the beginning: I had to work with flags, rules and a custom module. Perhaps it was also possible to achieve this without flags, but they can come in handy elsewhere on one's website (e.g. for granting userpoints to users), so that's a little bonus.

Step 1: Create a flag for comments 'First reaction on article'.

Step 2: Create a flag for articles 'Commented on this article'.

Step 3: Create a rule similar the one with the following settings:

{ "rules_new_reaction_on_article" : {
    "LABEL" : "New reaction on article",
    "PLUGIN" : "reaction rule",
    "OWNER" : "rules",
    "REQUIRES" : [ "rules", "flag", "comment" ],
    "ON" : { "comment_insert--comment_node_article" : { "bundle" : "comment_node_article" } },
    "IF" : [
      { "user_has_role" : {
          "account" : [ "comment:author" ],
          "roles" : { "value" : { "2" : "2" } },
          "operation" : "OR"
        }
      },
      { "NOT flag_flagged_node" : {
          "flag" : "commented-on-this-article",
          "node" : [ "comment:node" ],
          "flagging_user" : [ "comment:author" ]
        }
      },
      { "NOT data_is" : { "data" : [ "comment:author" ], "value" : [ "comment:node:author" ] } }
    ],
    "DO" : [
      { "flag_flagnode" : {
          "flag" : "commented-on-this-article",
          "node" : [ "comment:node" ],
          "flagging_user" : [ "comment:author" ],
          "permission_check" : 1
        }
      },
      { "flag_flagcomment" : {
          "flag" : "first-reaction-on-article",
          "comment" : [ "comment" ],
          "flagging_user" : [ "comment:author" ],
          "permission_check" : 1
        }
      }
    ]
  }
}

Step 4: Create a custom module 'Hiderating':

function hiderating_comment_view($comment) {
  $flag = flag_get_flag('first-reaction-on-article');
  $uid = db_query('SELECT n.uid FROM {node} n INNER JOIN {comment} c ON c.nid = n.nid WHERE c.cid = :cid', array(':cid' => $comment->cid))->fetchField();
  if ($comment->uid == $uid OR !$flag->is_flagged($comment->cid, $comment->uid)){
    $comment->content['field_stars']['#access'] = FALSE;
  }
}