How to grant user User Points after adding comment once? - drupal-7

Question

I created a rule to grant users User Points when they added a comment on a node. However, I'd like to grant them these points only once. That means: they don't get more points when they react a second or a third time on the same node, but they will be granted points nevertheless after commenting on another node.
How can I do that?

Answer 1

Rules must have:
Events: Before saving a comment
Conditions: this code
global $user;
$node =array();
$query = db_select('comment', 'c');
$query->fields('c', array('nid'));
$query->condition('c.uid', $user->uid);
$result = $query->execute();
while ($res = $result->fetchAll()) {
foreach ($res AS $re) {
$node[] = $re->nid;
}
}
if(!in_array($comment->nid, $node)){
return TRUE;
}
Actions: grant users User Points
=============================
Conditions: Execute custom PHP code
or create custom Conditions
/**
* Implements hook_rules_condition_info().
*/
function MYMODULE_rules_condition_info() {
$conditions = array();
$conditions['MYCONDITION'] = array(
'label' => t('lable'),
'parameter' => array(
'user' => array(
'type' => 'user',
'label' => t('User'),
),
),
'group' => t('Custom'),
'callbacks' => array(
'execute' => 'MYMODULE_rules_condition_MYCONDITION',
),
);
return $conditions;
}
function MYMODULE_rules_condition_MYCONDITION($user) {
$node =array();
$query = db_select('comment', 'c');
$query->fields('c', array('nid'));
$query->condition('c.uid', $user->uid);
$result = $query->execute();
while ($res = $result->fetchAll()) {
foreach ($res AS $re) {
$node[] = $re->nid;
}
}
if(!in_array($comment->nid, $node)){
return TRUE;
}
}

Answer 2

I solved my problem with the Flags module: I created the flags called 'Commented on this node' & 'First reaction'* and rule called 'Commented on a node'. These are my rule's settings:
EVENTS: After saving a new comment
CONDITIONS:
Content is of type Parameter: Content: [comment:node], Content types:
Article
NOT Node is flagged Parameter: Flag: Commented on this node, node:
[comment:node], User on whose behalf to check: [comment:author]
ACTIONS:
Grant points to a user Parameter: User: [comment:author],
Points: 2, Points category: Reaction, Entity: [comment:node],
Description: New reaction, Operation: Add,
Display: false, Moderate: Automatically approved
Flag a Node Parameter: Flag: Commented on a node, Node:
[comment:node], User on whose behalf to flag: [comment:author], Skip
permission check: false
Flag a Comment: Parameter: Flag: First reaction, Comment: [comment],
User on whose behalf to flag: [comment:author], Skip permission
check: false
So, every time a user adds a comment to a certain node for the first time, the node is flagged as 'Commented on a node', the reaction is flagged as 'First reaction' and the user who added the comment is rewarded 2 points.
**I use the 'First comment' flag in a related question.*