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  1. Nuxeo Platform
  2. NXP-12542

Handle empty list in content view parameter

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 5.7.2, 5.7.3, 5.7.3-SNAPSHOT
    • Fix Version/s: 5.7.3
    • Component/s: Content Views

      Description

      Summary: Fix the EL expression returned when using the NXQL IN operator and the list returned by the EL is empty

      schema:field IN ?
      => The EL is using a NULL field or the ('') expression
      

      More details
      I have a multivalued string field, activity:issues
      It contains references (uid) to documents (IssueDocument) and is filled using the "multiple document suggestion" widget.
      Then in another place (a tab) I need to display the list of issues in a content view. The NXQL filter for this content-view is just:

      ecm:uuid IN ?
      

      The parameter is:

      #{currentDocument.activity.issues}
      

      This works only if the filed is not empty (not null probably, for example when a new document is created). If it is empty, an error is displayed:

      Failed to execute query: org.nuxeo.ecm.core.query.QueryParseException: Syntax error: Invalid token <)> at offset 43 in query: SELECT * FROM Document WHERE (ecm:uuid IN ()) ORDER BY dc:title
      
      

      => We can see the expression returned just () instead of ('') with the quotes.
      So I added a condition to the parameter:

      #{empty currentDocument.activity.issues ? ('') ? currentDocument.activity.issues}
      

      The problem is that it still doesn't work if the list is empty. Like if at runtime, the parenthesis were removed:

      Syntax error: Invalid token <> at offset 43 in query: SELECT * FROM Document WHERE (ecm:uuid IN '') 
      
      

      I tried by changing the filter to add the parenthesis:

      ecm:uuid IN (?)
      

      But then the error is displayed when there is at least one value, because the expression adds the parenthesis too so we have "((":

      Syntax error: Invalid token <(> at offset 43 in query: SELECT * FROM Document WHERE (ecm:uuid IN (('9c1178b3-b6ff-4db9-99d8-688f61195a45'))
      
      

      The workaround found is about having an activity:issues_empty multivalued string field. For "about to create document" event, this field is filled with an empty string. Then, the ternary operator in the EL returns this field:

      #{empty currentDocument.activity.issues ? currentDocument.activity.issues_empty ? currentDocument.activity.issues}
      

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                Resolved:

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