grid error

Question

a!gridField( 
 data:index(local!datasubset,"data",{}), 
 columns:{ 
 a!gridColumn( 
 value:apply(concat(_,"-",_),merge(index(fv!row,"id",{}),index(fv!row,"exhibit_id",{})) 
 ) 
 ) 
 } 
 ) 
 Error comes:---- 
 at merge() function only list are allowed 
 .how i change fv!row to list

Mike Schmitt · Answer

Additionally, the "fv!row" structure is set up in such a way that it's automatically protected against accessing nonexistent properties via dot property, so we don't even need index() (or really, property(), grumble) here at all. 
 value: fv!row.id & "-" & fv!row.exhibit_id,

Richard Michaelis · Answer

why do you use apply() and not a!forEach? apply is simply outdated, but i think this looping is not needed in total. the input for data: parameter -> this lists are the rows you are iterating through merge() is for combining lists in a specific way. in a grid, which already walk through the array of data at the data parameter, you dont need looping usually on top of it. its kind of way over engineered . fv!row is like "fv!Item" of an "a!forEach" it represent one value of the looped array. make it easy: a!gridColumn(

value:concat(index(fv!row,"id",{}),"-",index(fv!row,"exhibit_id",{}))

)

grid error

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