extjs4.2 - extjs textarea returns field value as an array -

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I'm quite surprised by this.

When I get my field value from my exts form, the value for a texture is not string, but there is an array. The first element in the array is empty, and the second element keeps text in text.

Enter the image details here

I just click < Strong> getFieldValues ​​() calling: 

  var fields = form.getFieldValues ​​();

My UI expression looks like this: 

  {xtype: 'textarea', cls: 'packagedialog-info-textArea', name: 'description '}' In my  Ext.data.Model :  
  {name: 'description', type: 'String'},  
 
 should this work? I was expecting a string to return.


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