Apply a function to each row of a Dataset

Have a Dataset which is derived from the output from another program.
Have written some functions to retrieve and format this data.
Can make this work as intended by using Table to apply the function to each row of the Dataset.
But cannot achieve the same result when attempting to use some of the built in capabilities of Dataset.
Can someone point me in the right direction?

Below is the statement that works with Table but doesn’t work with the alternate syntax.
Both lines are intended to apply the function dsGetValueList to each row of dsApples.

dsAllAppleParamValues = Table[dsGetValueList[dsAllApples[i], dsApplesAllParams],
                              {i, 1, Length@dsAllApples}]; 

dsAllAppleParamValues2 =
dsAllApples[All, dsGetValueList[#, dsApplesAllParams] &] // Normal;

The structure of the Dataset might be non-standard, but it is derived from another program and that can’t be changed. Further background: the source file is a JSON file and that can be Import-ed with the option "RawJSON" to obtain a Dataset.

Code for a test case below. In summary the code changes data like this:

to this:

(*sample data*)
item01 = <| "name" -> "item01", "class" -> "apples" , 
  "params" -> {<| "name" -> "TYPE", "value" -> "fuji"|>
    , <| "name" -> "WEIGHT", "value" -> "0.5"|>
    , <| "name" -> "COLOR", "value" -> "red"|>
     }|>
item02 = <| "name" -> "item02", "class" -> "apples" , 
   "params" -> {<| "name" -> "TYPE", "value" -> "gala"|>
     , <| "name" -> "COLOR", "value" -> "red"|>
     , <| "name" -> "EXP_DATE", "value" -> "10/10/20"|>
     , <| "name" -> "WEIGHT", "value" -> "1.5"|>
      }|>;
item03 = <| "name" -> "item03", "class" -> "apples" , 
   "params" -> {<| "name" -> "TYPE", "value" -> "granny"|>
     , <| "name" -> "COLOR", "value" -> "green"|>
      }|>;
item04 =  <| "name" -> "item04", "class" -> "oranges" , 
   "params" -> {<| "name" -> "TYPE", "value" -> "navwl"|>
     , <| "name" -> "WEIGHT", "value" -> "3.5"|>
     , <| "name" -> "EXP_DATE", "value" -> "09/10/20"|>
      }|>;
item05 =  <| "name" -> "item05", "class" -> "oranges" , 
   "params" -> {<| "name" -> "TYPE", "value" -> "seville"|>
     , <| "name" -> "WEIGHT", "value" -> "1.5"|>
     , <| "name" -> "EXP_DATE", "value" -> "09/10/20"|>
      }|>;
dsAll = Dataset[{item01, item02, item03, item04, item05}];

(*useful functions*)
dsGetName[ds_] := ds["name"]
dsGetValue[ds_, pName_] :=  Module[{paramDS, valueList},
  paramDS =  ds["params"] ;
  valueList = Normal@paramDS[Select[#name == pName &] , "value"];
  If[Length[valueList] > 0, First[valueList], "-"]
  ]
dsGetValueList[ds_, pList_List] := 
 Module[{}, dsGetValue[ds, #] & /@ pList]

(*retrieve metadata about apples: their names and parameters*)
dsAllApples =  dsAll[Select[#class == "apples" &] ]
dsAllAppleNames = dsAllApples[All, dsGetName]  // Normal;
dsApplesAllParams = 
  dsAllApples[All, "params", All, "name"] // Normal // Flatten // 
   Union;
(*retrieve parameter values for each apple, there may be missing values*)
(**-- the first statement works as intended*)
(* -- second statement does not*)
dsAllAppleParamValues = 
  Table[dsGetValueList[dsAllApples[i], dsApplesAllParams], {i, 1, 
    Length@dsAllApples}];
dsAllAppleParamValues2 = 
  dsAllApples[All, dsGetValueList[#, dsApplesAllParams] &] // Normal;
Equal[dsAllAppleParamValues2, dsAllAppleParamValues]
(*format results*)
r1 = Prepend[Transpose[dsAllAppleParamValues], dsAllAppleNames] // 
   Transpose ;
TableForm[r1, 
 TableHeadings -> {None, Prepend[dsApplesAllParams, "Name"]}]

dsApples = dsAll[Select[#class === "apples" &], {"name", "params"}];

tmp = Join[dsApples[All, Key["name"] /* <|"Name" -> Identity|>], 
           Dataset[KeyUnion[(Apply[AssociationThread] @* Transpose) /@ 
                            Normal[dsApples[All, Lookup["params"] /* Values]],
                            Missing[] &]], 2];

tmp[All, {"Name", "COLOR", "EXP_DATE", "TYPE", "WEIGHT"}]

dsAllAppleParamValues2 = dsAllApples[
    All,
    dsGetValueList[Dataset@#, dsApplesAllParams]&
] //Normal;

dsAllAppleParamValues == dsAllAppleParamValues2

dsAll[
  Select[#class==="apples"&] /* KeyUnion
, <| "Name" -> #name, #name -> #value& /@ #params |>&
]

dsAll[
  Select[#class==="apples"&] /* KeyUnion
, <| "Name" -> #name, #name -> #value& /@ #params |>&
][All, {"Name", "COLOR", "EXP_DATE", "TYPE", "WEIGHT"}]