how to update field in databse using a!update

Question

I have created expression rule to find data like {{changeid:"1234",prioritystatus:null}} 
 
 now i want to update this list of dictionary using a!update how can i do that? i want to update that field prioritystatus. I am doing this by selection of one prioritylist in dropdown box. 
 I have done this in user interface and on changing this status it will update the above field in this list of dictionary. But it gives error. 
 I have done like this: 
 a!update (data: {{changeid:"1234",prioritystatus:null}},index:"prioritystatus",value:1)

Naresh · Answer

Hi, 
 You are passing a list of items in your data. Try this way it will work 
 a!update( a!map(changeid: "1234", prioritystatus: null), "prioritystatus", 1 ) 
 If you want to update list of values use below logic 
 a!update( { a!map(changeid: "1234", prioritystatus: null), a!map(changeid: "4567", prioritystatus: null) }, "prioritystatus", {1,2} )