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Hi
I need to replace multiple values in multiple columns based on a couple of translation tables.
The following solution provied values replacement on the entire table based on one translation table.
My question: is it possible, (based on the following solution or another) to control which column will be update i.e. -
Replace: Table [ Column1 ] values with 'Translation table1' values,
Table [ Column2 ] values with 'Ttranslation table2'....etc.
Here is @MarcelBeug great solution for the entire table (without controling which column will be updated)
List.Accumulate(Table.ToRows(Translations),Table1,(t,r) => Table.ReplaceValue(t,r{0},r{1},Replacer.ReplaceValue,Table.ColumnNames(t)))
http://community.powerbi.com/t5/Desktop/Power-Query-Batch-Replace-String/td-p/164402
Explanation:
Solved! Go to Solution.
If each translation table is for 1 column, then I would suggest to use Table.TransformColumns instead of Table.ReplaceValues.
The query below has a double loop:
1. Outer loop over the columns in which values must be replaced (in the example: Name and Surname)
with the translation tables to use (in the example TranslationTable1 and -2),
2. Inner loop over each entry in the translation list.
r1 = Transformspecs, r1{0} = Column name to transform, r1{1} = translation list
t1/t2 = the table that is being transformed
r2 = translation list: r2{0} = old value, r2{1} = new value.
let ColumnsToTransform = {"Name", "Surname"}, TranslationLists = List.Buffer({Table.ToRows(TranslationTable1),Table.ToRows(TranslationTable2)}), TransformSpecs = List.Buffer(List.Zip({ColumnsToTransform,TranslationLists})), Source = Table1, Replaced = List.Accumulate( TransformSpecs, Source, (t1,r1) => List.Accumulate( r1{1}, t1, (t2,r2) => Table.TransformColumns( t2, {r1{0}, each Replacer.ReplaceValue(_,r2{0},r2{1})} ) ) ), Result = Value.ReplaceType(Replaced,Value.Type(Source)) in Result
If each translation table is for 1 column, then I would suggest to use Table.TransformColumns instead of Table.ReplaceValues.
The query below has a double loop:
1. Outer loop over the columns in which values must be replaced (in the example: Name and Surname)
with the translation tables to use (in the example TranslationTable1 and -2),
2. Inner loop over each entry in the translation list.
r1 = Transformspecs, r1{0} = Column name to transform, r1{1} = translation list
t1/t2 = the table that is being transformed
r2 = translation list: r2{0} = old value, r2{1} = new value.
let ColumnsToTransform = {"Name", "Surname"}, TranslationLists = List.Buffer({Table.ToRows(TranslationTable1),Table.ToRows(TranslationTable2)}), TransformSpecs = List.Buffer(List.Zip({ColumnsToTransform,TranslationLists})), Source = Table1, Replaced = List.Accumulate( TransformSpecs, Source, (t1,r1) => List.Accumulate( r1{1}, t1, (t2,r2) => Table.TransformColumns( t2, {r1{0}, each Replacer.ReplaceValue(_,r2{0},r2{1})} ) ) ), Result = Value.ReplaceType(Replaced,Value.Type(Source)) in Result
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