I'm trying to get FieldMappings—Help | ArcGIS Desktop to work. The need is to append records from one table to records of a different table with the NO_TEST option as the two don't have the same schemas. I've tried with a table to table append, and also with a feature class to feature class append. In both cases I can get the records from one table to append to the target table, and feature geometry to append to the target feature class. But.... None of the attribute values come over in either case. This has to be one of the most complex processes I've ever seen, and I cannot for the life of me see where the issue is. Below is the python script I'm using to do it; pretty much right out of the help page. If anyone has had this work for them, perhaps your second set of eyes is what I need.... import arcpy in_file1 = r 'C:\Replicas\Replicas.gdb\MasterStreetNameFC' #arcpy.MakeTableView_management(view1,in_file1) #output_file = r'C:\Replicas\Replicas.gdb\CoordOverlapErrors' output_file = r 'C:\Replicas\Replicas.gdb\Points' fm_streetname = arcpy . FieldMap ( ) fm_type = arcpy . FieldMap ( ) fm_housedir = arcpy . FieldMap ( ) fm_begrange = arcpy . FieldMap ( ) fm_endrange = arcpy . FieldMap ( ) fm_begcoord = arcpy . FieldMap ( ) fm_endcoord = arcpy . FieldMap ( ) fm_streetdir = arcpy . FieldMap ( ) fm_cityjurs = arcpy . FieldMap ( ) fm_zipcode = arcpy . FieldMap ( ) fm_oid = arcpy . FieldMap ( ) fms = arcpy . FieldMappings ( ) ##s_name = 'StreetName' ##s_type = 'Type' ##s_housedir = 'HouseDir' ##s_begrange = 'BegRange' ##s_endrange = 'EndRange' ##s_begcoord = 'BegCoord' ##s_endcoord = 'EndCoord' ##s_streetdir = 'StreetDir' ##s_cityjurs = 'CityJurs' ##s_zipcode = 'ZipCode' ##s_oid = 'OBJECTID' ## ## These variables are commented out ## as I used the actual field names below ## thinking maybe the variables were the problem... fm_streetname . addInputField ( in_file1 , 'StreetName' ) fm_type . addInputField ( in_file1 , 'Type' ) fm_housedir . addInputField ( in_file1 , 'HouseDIr' ) fm_begrange . addInputField ( in_file1 , 'BegRange' ) fm_endrange . addInputField ( in_file1 , 'EndRange' ) fm_begcoord . addInputField ( in_file1 , 'BegCoord' ) fm_endcoord . addInputField ( in_file1 , 'EndCoord' ) fm_streetdir . addInputField ( in_file1 , 'StreetDir' ) fm_cityjurs . addInputField ( in_file1 , 'CityJurs' ) fm_zipcode . addInputField ( in_file1 , 'ZipCode' ) fm_oid . addInputField ( in_file1 , 'OBJECTID' ) StreetName1 = fm_streetname . outputField Type1 = fm_type . outputField HouseDir1 = fm_housedir . outputField BegRange1 = fm_begrange . outputField EndRange1 = fm_endrange . outputField BegCoord1 = fm_begcoord . outputField EndCoord1 = fm_endcoord . outputField StreetDir1 = fm_streetdir . outputField CityJurs1 = fm_cityjurs . outputField Zip1 = fm_zipcode . outputField OID1 = fm_oid . outputField # StreetName2 = fm_streetname . outputField Type2 = fm_type . outputField HouseDir2 = fm_housedir . outputField BegRange2 = fm_begrange . outputField EndRange2 = fm_endrange . outputField BegCoord2 = fm_begcoord . outputField EndCoord2 = fm_endcoord . outputField StreetDir2 = fm_streetdir . outputField CityJurs2 = fm_cityjurs . outputField Zip2 = fm_zipcode . outputField OID2 = fm_oid . outputField fms . addFieldMap ( fm_streetname ) fms . addFieldMap ( fm_type ) fms . addFieldMap ( fm_housedir ) fms . addFieldMap ( fm_begrange ) fms . addFieldMap ( fm_endrange ) fms . addFieldMap ( fm_begcoord ) fms . addFieldMap ( fm_endcoord ) fms . addFieldMap ( fm_streetdir ) fms . addFieldMap ( fm_cityjurs ) fms . addFieldMap ( fm_zipcode ) fms . addFieldMap ( fm_oid ) arcpy . Append_management ( in_file1 , output_file , 'NO_TEST' , fms )

Let me give that a shot Xander. Thanks! xander_bakker

I'm not a big fan of Field Mappings. I normally prefer using cursors. Perhaps this could work (although I haven't tested it): import arcpy in_file1 = r 'C:\Replicas\Replicas.gdb\MasterStreetNameFC' output_file = r 'C:\Replicas\Replicas.gdb\Points' # keys are input field, values are the matching output fields dct_fields = { 'StreetName' : 'Street_Name' , 'Type' : 'StreetType' , 'HouseDIr' : 'House_Dir' , 'BegRange' : 'Start_Range' , 'EndRange' : 'End_Range' , 'BegCoord' : 'Start_Coord' , 'EndCoord' : 'End_Coord' , 'StreetDir' : 'Street_Dir' , 'CityJurs' : 'City_Jurs' , 'ZipCode' : 'ZIPcode' } flds_in = dct_fields . keys ( ) flds_in . insert ( 0 , 'SHAPE@' ) # add the geometru field flds_out = dct_fields . values ( ) flds_out . insert ( 0 , 'SHAPE@' ) with arcpy . da . InsertCursor ( output_file , flds_out ) as curs_out : with arcpy . da . SearchCursor ( in_file1 , flds_in ) as curs_in : for row_in in curs_in : row_out = tuple ( list ( row_in ) ) curs_out . insertRow ( row_out )

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FieldMap and FieldMappings arrgh....

JoeBorgione

I'm trying to get FieldMappings—Help | ArcGIS Desktop to work. The need is to append records from one table to records of a different table with the NO_TEST option as the two don't have the same schemas. I've tried with a table to table append, and also with a feature class to feature class append. In both cases I can get the records from one table to append to the target table, and feature geometry to append to the target feature class. But.... None of the attribute values come over in either case. This has to be one of the most complex processes I've ever seen, and I cannot for the life of me see where the issue is. Below is the python script I'm using to do it; pretty much right out of the help page. If anyone has had this work for them, perhaps your second set of eyes is what I need....

<SPAN class="keyword token">import</SPAN> arcpy

in_file1 <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\Replicas\Replicas.gdb\MasterStreetNameFC'</SPAN>
<SPAN class="comment token">#arcpy.MakeTableView_management(view1,in_file1)</SPAN>
<SPAN class="comment token">#output_file = r'C:\Replicas\Replicas.gdb\CoordOverlapErrors'</SPAN>
output_file <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\Replicas\Replicas.gdb\Points'</SPAN>

fm_streetname <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_type <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_housedir <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_begrange <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_endrange <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_begcoord <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_endcoord <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_streetdir <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_cityjurs <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_zipcode <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
fm_oid <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMap<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>

fms <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FieldMappings<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="comment token">##s_name = 'StreetName'</SPAN>
<SPAN class="comment token">##s_type = 'Type'</SPAN>
<SPAN class="comment token">##s_housedir = 'HouseDir'</SPAN>
<SPAN class="comment token">##s_begrange = 'BegRange'</SPAN>
<SPAN class="comment token">##s_endrange = 'EndRange'</SPAN>
<SPAN class="comment token">##s_begcoord = 'BegCoord'</SPAN>
<SPAN class="comment token">##s_endcoord = 'EndCoord'</SPAN>
<SPAN class="comment token">##s_streetdir = 'StreetDir'</SPAN>
<SPAN class="comment token">##s_cityjurs = 'CityJurs'</SPAN>
<SPAN class="comment token">##s_zipcode = 'ZipCode'</SPAN>
<SPAN class="comment token">##s_oid = 'OBJECTID'</SPAN>
<SPAN class="comment token">##</SPAN>
<SPAN class="comment token">## These variables are commented out</SPAN>
<SPAN class="comment token">## as I used the actual field names below</SPAN>
<SPAN class="comment token">## thinking maybe the variables were the problem...</SPAN>


fm_streetname<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN><SPAN class="string token">'StreetName'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_type<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Type'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_housedir<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'HouseDIr'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_begrange<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'BegRange'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_endrange<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'EndRange'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_begcoord<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'BegCoord'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_endcoord<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'EndCoord'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_streetdir<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'StreetDir'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_cityjurs<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'CityJurs'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_zipcode<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'ZipCode'</SPAN><SPAN class="punctuation token">)</SPAN>
fm_oid<SPAN class="punctuation token">.</SPAN>addInputField<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'OBJECTID'</SPAN><SPAN class="punctuation token">)</SPAN>

StreetName1 <SPAN class="operator token">=</SPAN> fm_streetname<SPAN class="punctuation token">.</SPAN>outputField
Type1 <SPAN class="operator token">=</SPAN> fm_type<SPAN class="punctuation token">.</SPAN>outputField
HouseDir1 <SPAN class="operator token">=</SPAN> fm_housedir<SPAN class="punctuation token">.</SPAN>outputField
BegRange1 <SPAN class="operator token">=</SPAN> fm_begrange<SPAN class="punctuation token">.</SPAN>outputField
EndRange1 <SPAN class="operator token">=</SPAN> fm_endrange<SPAN class="punctuation token">.</SPAN>outputField
BegCoord1 <SPAN class="operator token">=</SPAN> fm_begcoord<SPAN class="punctuation token">.</SPAN>outputField
EndCoord1 <SPAN class="operator token">=</SPAN> fm_endcoord<SPAN class="punctuation token">.</SPAN>outputField
StreetDir1 <SPAN class="operator token">=</SPAN> fm_streetdir<SPAN class="punctuation token">.</SPAN>outputField
CityJurs1 <SPAN class="operator token">=</SPAN> fm_cityjurs<SPAN class="punctuation token">.</SPAN>outputField
Zip1&nbsp; <SPAN class="operator token">=</SPAN> fm_zipcode<SPAN class="punctuation token">.</SPAN>outputField
OID1 <SPAN class="operator token">=</SPAN> fm_oid<SPAN class="punctuation token">.</SPAN>outputField
<SPAN class="comment token">#</SPAN>
StreetName2 <SPAN class="operator token">=</SPAN> fm_streetname<SPAN class="punctuation token">.</SPAN>outputField
Type2 <SPAN class="operator token">=</SPAN> fm_type<SPAN class="punctuation token">.</SPAN>outputField
HouseDir2 <SPAN class="operator token">=</SPAN> fm_housedir<SPAN class="punctuation token">.</SPAN>outputField
BegRange2 <SPAN class="operator token">=</SPAN> fm_begrange<SPAN class="punctuation token">.</SPAN>outputField
EndRange2 <SPAN class="operator token">=</SPAN>&nbsp; fm_endrange<SPAN class="punctuation token">.</SPAN>outputField
BegCoord2 <SPAN class="operator token">=</SPAN> fm_begcoord<SPAN class="punctuation token">.</SPAN>outputField
EndCoord2 <SPAN class="operator token">=</SPAN>&nbsp; fm_endcoord<SPAN class="punctuation token">.</SPAN>outputField
StreetDir2 <SPAN class="operator token">=</SPAN> fm_streetdir<SPAN class="punctuation token">.</SPAN>outputField
CityJurs2 <SPAN class="operator token">=</SPAN> fm_cityjurs<SPAN class="punctuation token">.</SPAN>outputField
Zip2 <SPAN class="operator token">=</SPAN> fm_zipcode<SPAN class="punctuation token">.</SPAN>outputField
OID2 <SPAN class="operator token">=</SPAN> fm_oid<SPAN class="punctuation token">.</SPAN>outputField

fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_streetname<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_type<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_housedir<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_begrange<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_endrange<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_begcoord<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_endcoord<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_streetdir<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_cityjurs<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_zipcode<SPAN class="punctuation token">)</SPAN>
fms<SPAN class="punctuation token">.</SPAN>addFieldMap<SPAN class="punctuation token">(</SPAN>fm_oid<SPAN class="punctuation token">)</SPAN>

arcpy<SPAN class="punctuation token">.</SPAN>Append_management<SPAN class="punctuation token">(</SPAN>in_file1<SPAN class="punctuation token">,</SPAN>output_file<SPAN class="punctuation token">,</SPAN><SPAN class="string token">'NO_TEST'</SPAN><SPAN class="punctuation token">,</SPAN>fms<SPAN class="punctuation token">)</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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JoeBorgione

I've applied the da.search cursor in similar situations and they are too slow, if you have a user waiting for the results. However, this particular application may well be served as an over-nighter.

KevinBell1

My code usually runs off-hours, so I'll take a performance hit for the sake of more simple code. Has anyone bench marked the difference? I thought da.xCursors were super fast!

JoeBorgione

Kev- couldn't agree with you more: field mapping is indeed a quagmire. In this particular case though a cursor is probably going be sluggish at best.

JamesMacKay3

I usually stick with cursors as well but I've found using off-the-shelf tools and field mappings typically provide better performance than cursors... So if it's something I'm going to be running regularly and performance matters, I bite the bullet and get into mappings.

KevinBell1

I've never been a big fan of the fieldmapping quagmire, probably because I'm much too lazy to read the docs. If I were appending to a table NO_TEST style, I'd read the data from the origin table w/ a search cursor and then simply use an insert cursor on the append table and keep my fields straight.

JoeBorgione

Hey mbabinski1988‌ ; that looks promising for my application. Thanks for the tip!

MicahBabinski

Hey Joe,

If you don't want to hard code your field mappings, here's a way to store the info in a table that then you can then use as a parameter in a custom tool. It will build the field mappings object for you and then append the data as specified in your table.

https://community.esri.com/thread/182353-build-arcpy-field-mapping-object-from-table

Micah

JamesMacKay3

If that doesn't work, try adding this second line after your line 20:

fms = arcpy.FieldMappings()
fms.addTable(in_file1)<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

JoeBorgione

Thanks for your reply, but I don't quite follow what you are suggesting. FWIW, it appears I missed this section provided in the help:

<SPAN class="comment token"># Set the output field properties for both FieldMap objects </SPAN>
type_name <SPAN class="operator token">=</SPAN> fm_type<SPAN class="punctuation token">.</SPAN>outputField 
type_name<SPAN class="punctuation token">.</SPAN>name <SPAN class="operator token">=</SPAN> <SPAN class="string token">'Veg_Type'</SPAN> 
fm_type<SPAN class="punctuation token">.</SPAN>outputField <SPAN class="operator token">=</SPAN> type_name 
diam_name <SPAN class="operator token">=</SPAN> fm_diam<SPAN class="punctuation token">.</SPAN>outputField 
diam_name<SPAN class="punctuation token">.</SPAN>name <SPAN class="operator token">=</SPAN> <SPAN class="string token">'Veg_Diam'</SPAN> 
fm_diam<SPAN class="punctuation token">.</SPAN>outputField <SPAN class="operator token">=</SPAN> diam_name<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

I'm hoping that's all it is....

JamesMacKay3

I'm not sure if it's strictly necessary or if it's possible to achieve the equivalent result without it, but when creating the FieldMappings object in the past I've called the addTable method immediately after creation, passing in the input dataset(s).

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