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ModScript question - Map object '.insert" method doesn't seem to work as documented

PM Thompson

I attempted to solve this through tech support but failed.

Lines 4 and 5 reassign the variable "mymap_pair2". Why does this fail?
Lines 11 and 12 attempt to add a Map_Pair object to a Map. According to the documentation this should be a valid operation. Lines 8 and 9 do this and don't fail. Why do lines 11 and 12 fail?

// this is line 0
var my_map = Map();                                         // works. -- my_map is a : chai:Map :: .size = '0' :: to_json = '{}'

var mymap_pair2 = Map_Pair();                               // works. -- mymap_pair2 is a : chai:Map_Pair :: .first() is a chai:string ; .second() is a chai:UNDEFINED
mymap_pair2 = Map_Pair();                                   // DOES NOT WORK --- WHY???
mymap_pair2 = Map_Pair("key string 3","value string 3");    // DOES NOT WORK --- WHY???

my_map["key string 1"] = "value string 1" ;                 // works. -- my_map is a : chai:Map :: .size = '1' :: to_json = '{"key string 1" : "value string 1"}'
my_map.insert(["key string 2":"value string 2"]);           // works. -- my_map is a : chai:Map :: .size = '2' :: to_json = '{"key string 1" : "value string 1","key string 2" : "value string 2"}'
var mymap_pair = Map_Pair("key string 3","value string 3"); // works. --mymap_pair is a : chai:Map_Pair :: .first() is a : chai:string ='key string 3' ; .second() is a : chai:string ='value string 3'

my_map.insert(mymap_pair);                                  // DOES NOT WORK --- I THINK THIS SHOULD WORK ACCORDING TO DOCUMENTATION
my_map.insert(Map_Pair("key string 4","value string 4"));   // DOES NOT WORK --- I THINK THIS SHOULD WORK ACCORDING TO DOCUMENTATION
// this is line 13

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  • 0  

    Hi Paul. Regarding 4/5, I have seen that before. Same thing happens if you assign a Field object (such as from AppRecord.Fields()) to a var. It does not have an issue in a loop though. I do know that the first time you assign a value to a var, it's type is locked in. So apparently if the object would have been "set" in AppScript, it probably can't change in ModScript.

    I haven't tried the insert approach. But it should be sufficient to do something like my_map["key string 4"]="value string 4".

  • Suggested Answer

    0   in reply to   

    Garry's interpretation seems correct on the 4/5, that Modscript does not want to reassign the Map Pair to one that is already verified. When I do a try /catch on it: 

    try{mymap_pair2 = Map_Pair()}
    catch(error){out.push_back("Error with mymap_pair2 = Map_Pair() : ${error.what()}.  " )}

    Here is what I get:

    "Error with mymap_pair2 = Map_Pair() : Error: \"Unable to find appropriate'=' operator.\" With parameters: (Map_Pair, Map_Pair) .  "

    I tried the latter one as well,my_map.insert(mymap_pair) , and I think that that broken, at least compared to what the documentation says. Here is the error:

    "Error with function dispatch for function 'insert'\" With parameters: (Map).(Map_Pair) . "

    Note that I tried the .insert function with another Map and it works fine.

  • 0 in reply to   

    Thanks Garry.  I'm still at the point where I'm trying to figure out some of the nuances of Chai/Mod script.  When I run into stuff like this I have to wonder if my brain is off-track or there's something else.

    RE lines 4,5; I know about the type-lock feature.  In this case it appears that the variable becomes readonly or perhaps ModScript thinks that assigning a different Map_Pair object is changing the variable's underlying type.

  • 0   in reply to   

    Nice use of the Try/Catch  

  • Suggested Answer

    0  

    I ran into a similar problem today and at least for my SBM 12.2 system, the reason for Map::insert(Map_Pair) not working is simple:
    There is no such method defined.

    The following code 

    generates the error message

    which tells that there actually is just one insert method defined for the Map class, and that method takes another Map instance as a parameter.
    No method that takes a Map_Pair instance is present.

    So, either the SBM documentation is wrong, the method implementation is missing, or both :)

    Note, however, that adding the missing method is really simple:

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