How to split a column based on first occurrence of a delimter MongoDB - mongodb

Question

I have A column like this and it should be split based on the first "-", example is below
MGESAD :
"6095 - NCAM - US - GIUTCB - US Consumer Bank - USRB"
"6595 - NBAM - US - UDAS - Consumer Bank - USRB"
"0595 - NWWAM - US - GWCB - US BANK Bank - USRB - TBL"
I need to split this column into:
Col1 Col2
6095 NCAM - US - GIUTCB - US Consumer Bank - USRB
6595 NBAM - US - UDAS - Consumer Bank - USRB
0595 NWWAM - US - GWCB - US BANK Bank - USRB - TBL
Tried So far:
db.getCollection("arTes").aggregate([
{
$addFields: {
MGE_ID: { $arrayElemAt: [ { "$split": [ "$MGESAD y", "-"] }, 0 ] },
MGE_DESC: { $arrayElemAt:[{ "$split": [ "$MGESAD ", "-"] },2] }
}
}
])
MGE_DESC is giving only 2 element I need entire string excluding the first split.
Let me know if there is any eaiser way to do this?

Answer 1

Query
pipeline update requires MongoDB >= 4.2
because you want to split on first index of "-" you can do it with out splitting in all "-" occurences
the bellow finds the index of "-" the left part is the MGESAD and the right is the MGE_DESC
*if you only want to aggregate, use the pipeline ["$set" ...] in aggregation
*if you wanted to do this not for the first or last "-" you could split and then $concat and maybe $reduce depending on your needs but here its more simple so those weren't used
PlayMongo
updade({},
[{"$set":
{"MGESAD":
{"$substrCP": ["$MGESAD", 0, {"$indexOfCP": ["$MGESAD", " - "]}]},
"MGE_DESC":
{"$substrCP":
["$MGESAD",
{"$add": [{"$indexOfCP": ["$MGESAD", " - "]}, 3]},
{"$strLenCP": "$MGESAD"}]}}}],
{"multi" : true})