Invalid content ID (document deleted)

Question

Through a form in an interface, I upload files or images and it is stored in my db as a number (I guess it's the ID, image bellow). The images are stored in a folder in my KC 
 This is the expression of my fileupload 
 a!fileUploadField(
 label: "Cedula: PARTE FRONTAL",
 labelPosition: "ABOVE",
 target: cons!CWA_OEC_DOCUMENTS_FOLDER_POINTER,
 fileNames: ri!CWA_OECClient.coeccedula&"_"&"c1_frontCI",
 maxSelections: 1,
 value: ri!CWA_OECClient.coecfile1,
 saveInto: ri!CWA_OECClient.coecfile1,
 required: true,
 validations: if(
 or(upper(fv!files.extension) = { "PDF","PNG","JPG" }),
 null,
 "Please upload a valid image type: png or jpg"
 ),
 uploadMethods: { "CAMERA", "CHOOSE_PHOTO", "CHOOSE_FILE" },
 buttonDisplay: "LABEL_AND_ICON",
 buttonStyle: "PRIMARY",
 buttonSize: "LARGE"
 ), 
 
 I deleted all the files and images of my KC, and now i cant see the other data of my db in the summary view. 
 When I go to the summary of a record to see the other data I get this error

ujjwalr0002 · Answer

To handle this error you can apply a check to whether the document ID is valid or not. 
 a!localVariables(
 local!document: 46,/*ID for any document */
 local!contentData: if(
 isnull(local!document),
 null,
 getcontentobjectdetailsbyid(local!document)
 ),
 if(
 isnull(local!document),
 false(),
 and(
 not(
 exact(
 local!contentData,
 "No object with this ID has been found"
 )
 ),
 find("Type: Document", local!contentData)
 )
 )
)

Mike Schmitt · Answer

That works though as a design note, it's a lot of manual work to do (and remember) if you end up with lots of places in your system where you need to do something similar. I usually encapsulate checks like these in an easy-to-remember / easy-to-find expression rule that takes a doc / docId and returns a simple boolean output. For instance the following, which you could name "rule!GLBL_docExists()" or similar: 
 and(
 a!isNotNullOrEmpty(ri!doc),
 tointeger(ri!doc) > 0,
 
 isobjectexists("Document", ri!doc)
) 
 Note: this uses the Check Object Existence plug-in, though it would only require a minor tweak to use the Content Tools rule (as seen above) instead in a similar implementation.

Invalid content ID (document deleted)

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