Documents Image upload issue

Question

Hi All, 
 I am going through Appian Developer course, where I am trying to work on 
 Design Record Types: Model and Configure Your Data 
 
 while following below steps 
 
 Follow the steps below to format the Image column. 
 1. Under Columns, click Image. 
 2. Under Display Value, click DISPLAY OPTIONS. 
 3. Select DOCUMENT IMAGE. 
 4. Under Display Value, click Image. 
 5. Under Images, click Document Image. 
 6. Under Document, click the a!EXAMPLE_DOCUMENT_IMAGE() to edit as expression. 
 ● In the Expression Editor, delete all text, and enter the following expression: 
 if( a!isNullOrEmpty( fv!row[recordType!WSA Vehicle.fields.image] ), a!EXAMPLE_DOCUMENT_IMAGE(), fv!row[recordType!WSA Vehicle.fields.image] ) 
 This expression checks whether the image field is null. If it is null, it displays an example document image. The example document image is displayed for existing vehicle data; you will be able to upload vehicle images when you add new vehicles to the fleet in later exercises. 
 ● Click OK 
 
 I am facing the below error which is stopping me to proceed. I am just going through the steps provided above in Appian Academy. 
 
 Expression evaluation error: Syntax error. Details: Expression evaluation error at function a!isNullOrEmpty parameter 1 [line 3]: Invalid index operator ''vehicle'' (expecting comma). 
 
 Can any one please help me in resolving this issue. Thanks in advance.

Mudit_Sharma · Answer

Hi lakshmipramodchakravarthyv0584 There are few points to be highlighted- 1. If () function expects 3 parameters, you have just provided 2. 2. The images will not be shown directly the way you have shown inside a grid column. 3. If you are directly putting the code in document image, then you can only copy the subset of the code which I have mentioned. (only the if() function part) The below code applies for entire grid column. Just for your reference- try replacing the code the way I have written, it will work. Note- Remember to change the record type AA vehicle with your own record type as used. a!gridColumn(
 label: "Image",
 helpTooltip: "Test images may not represent the actual vehicle",
 value: a!imageField(
 images: a!documentImage(
 document: if(
 /*Replace with your record type*/
 isnull(
 fv!row['recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle.fields.{c7d0b689-e98f-4cb7-8477-6c63943b30a0}image']
 ),
 a!EXAMPLE_DOCUMENT_IMAGE(),
 /*Replace with your record type*/
 fv!row['recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle.fields.{c7d0b689-e98f-4cb7-8477-6c63943b30a0}image']
 )
 ),
 size: "SMALL"
 ),
 align: "CENTER"
 ),