Modify duplicate names

src/groupeddataframe/grouping.jl

@@ -263,6 +263,7 @@ end
 """
     combine(gd::GroupedDataFrame, cols => f...)
     combine(gd::GroupedDataFrame; (colname = cols => f)...)
+    combine(gd::GroupedDataFrame; [colname = cols => f]...)
     combine(gd::GroupedDataFrame, f)
     combine(f, gd::GroupedDataFrame)
 
@@ -400,31 +401,26 @@ function combine(gd::GroupedDataFrame, args::Union{Pair, AbstractVector{<:Pair}}
     # The functions just get collected 
     pairs_main = collect(args)
 
-    # This next section handles duplicate names. This code is from a constructor
-    # for a DataFrame and I need to figure out how toget it to do what I want
-    #=
-    for (i, name) if enumerate(names_pair) 
-        k = 1
-        while true
-            # we only make sure that new column name is unique
-            # if df originally had duplicates in names we do not fix it
-            nn = Symbol("$(name)_$k")
-            if 
-                name = nn
-                break
-            end
-            k += 1
-        end
-    end
-    =#
-
     # Combine the pair arguments and the keyword arguments
     combined_nams = vcat(nams_kw, nams_main)
     combined_pairs = vcat(pairs_kw, pairs_main)
 
+    # This next section handles duplicate names.
+    # We do it for the user because we auto-generate so conflicts are our fault
+    # TODO: see if we need to make this faster
+    for (i, name1) in enumerate(combined_nams)
+        k = 1 
+        for (j, name2) in enumerate(combined_nams)
+            if i != j && name1 == name2
+                combined_nams[j] = Symbol("$(name2)_$(k)")
+                k += 1
+            end
+        end
+    end
+
     @show nt_of_pairs = NamedTuple{Tuple(combined_nams)}(Tuple(combined_pairs))
 
-    _combine(nt_of_pairs, gd)
+    #_combine(nt_of_pairs, gd)
 end
 
 # Wrapping automatically adds column names when the value returned