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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2006-10-31T11:18:55-08:00" itemprop="datePublished">October 31, 2006</time></li>
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  84                   <ul>
  85   <li>Implemented cloning procedure for DMD/CQ</li>
  86 </ul>
  87                   <h3>How to clone a parent CQ record to a child</h3>
  88
  89 <p>You would think that this would be clearly documented in the CQ manual but it isn't. The requirement is clear enough - "implement parent/child relationships for a CQ record... Oh and when a child is created could you copy everything from the parent and we'll change what's different in the child".</p>
  90
  91 <p>Implementing a parent/child relationship is pretty clear and documented - basically you create a reference link in the current record back to itself. CQ even has a parent/child control that handles manipulating the relationship allowing the user the controls to link in existing records, delete a parent/child relationship or add a new record as a child of this record. But there is nothing in there about copying data from the parent to the child. This you must do with hooks. But how to code the hooks?</p>
  92
  93 <p>I found a method for doing this and implemented the following. The trick is to add pre and post hooks to the <b>New</b> button of the parent/child control. This button is selected when the user wishes to add a new child record to this parent. The pre action hook, created as a <i>Record Script</i> set a session wide variable saying "Hey I'm adding a new child record to this parent". This variable contains the ID of the parent. The following code accomplishes this:</p>
  94
  95 <div class=code><pre>
  96 my $session = $entity->GetSession;
  97
  98 $session->NameValue ("ParentID", $entity->GetFieldValue ("id")->GetValue);
  99 </pre></div>
 100
 101 <p>After creating this record script add it as the pre-action hook for the new button. Don't forget to toggle the Enable for CQ Web (I don't really understand why you would ever not toggle that).</p>
 102
 103 <p>For the post-action script you are basically saying "Hey I'm no longer adding a new child record to this parent" with the following code:
 104
 105 <div class=code><pre>
 106 my $session = $entity->GetSession;
 107
 108 $session->NameValue ("ParentID", "");
 109 </pre></div>
 110
 111 <p>What this does is effectively bound the time you are in this unique situation - any other time the global session variable ParentID will be blank. Now the cloning can begin...</p>
 112
 113 <p>In the default value hooks for each field you want cloned place the following call:</p>
 114
 115 <div class=code><pre>
 116 CloneField ($fieldname);
 117 </pre></div>
 118
 119 <p>This is written as a call to a Global Script since the code will always be the same and because you'll have to do this for each field that you wish cloned.</p>
 120
 121 <p>Finally, create the following Global Script:</p>
 122
 123 <div class=code><pre>
 124 sub CloneField {
 125   my $fieldname = shift;
 126
 127   # Check session wide global, ParentID, and if set retrieve
 128   # the parent record and clone this field
 129   my $session  = $entity->GetSession;
 130   my $parentID = $session->GetNameValue ("ParentID");
 131
 132   if ($parentID ne "") {
 133     # If ParentID is not blank then we are adding a subtask.
 134     # Copy this field from the parent to this new child.
 135
 136     # Get the parent record
 137     my $parent = $session->GetEntity ("ChangeRequest", $parentID);
 138
 139     # Set the child field
 140     $entity->SetFieldValue (
 141         $fieldname,
 142         $parent->GetFieldValue ($fieldname)->GetValue
 143     );
 144   } # if
 145 } # CloneField
 146 </pre></div>
 147
 148 <p>This script checks to see if the session global "ParentID" is not blank, indicating that we are in this special mode of adding a new child to an existing parent, and if so, gets the parent record and the field value based on the passed in field name. Finally it sets the field value based on the field name to that of the value of the corresponding parent's field value.</p>
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