Conversion of a DimArray with NoMetadata() to a YAXArray fails

[felixcremer]

When I try to convert a rasterisation from Rasters.jl to a YAXArray this fails, because YAXArray can't deal with the DimensionalData.Dimensions.LookupArrays.NoMetadata type.
For a MWE see rafaqz/Rasters.jl#337.

When I try to convert the raster file I get the error below, but I can circumvent it when I force a metadata entry like so:

#This works because of the metadata entry.
julia> yaxconvert(YAXArray, DimArray(shpras, metadata=Dict("freqpath"=>freqpath)))

I am not sure, whether it is worth it to fix this when we are switching to DimensionalData.

yaxconvert(YAXArray, DimArray(shpras))
ERROR: MethodError: Cannot `convert` an object of type 
  DimensionalData.Dimensions.LookupArrays.NoMetadata to an object of type 
  Dict{String}
Closest candidates are:
  convert(::Type{T}, ::T) where T<:AbstractDict at abstractdict.jl:559
  convert(::Type{T}, ::AbstractDict) where T<:AbstractDict at abstractdict.jl:561
  convert(::Type, ::GeoInterface.AbstractGeometryTrait, ::Any) at ~/.julia/packages/GeoInterface/J298z/src/fallbacks.jl:112
  ...
Stacktrace:
 [1] YAXArray(axes::Vector{RangeAxis{Float64, S, R} where {S, R<:AbstractVector{Float64}}}, data::Raster{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Matrix{Union{Missing, Int64}}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata, Missing}, properties::DimensionalData.Dimensions.LookupArrays.NoMetadata, chunks::DiskArrays.GridChunks{2}, cleaner::Vector{YAXArrays.Cubes.CleanMe})
   @ YAXArrays.Cubes ~/.julia/dev/YAXArrays/src/Cubes/Cubes.jl:119
 [2] YAXArray(axes::Vector{RangeAxis{Float64, S, R} where {S, R<:AbstractVector{Float64}}}, data::Raster{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Matrix{Union{Missing, Int64}}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata, Missing}, properties::DimensionalData.Dimensions.LookupArrays.NoMetadata; cleaner::Vector{YAXArrays.Cubes.CleanMe}, chunks::DiskArrays.GridChunks{2})
   @ YAXArrays.Cubes ~/.julia/dev/YAXArrays/src/Cubes/Cubes.jl:130
 [3] YAXArray(axes::Vector{RangeAxis{Float64, S, R} where {S, R<:AbstractVector{Float64}}}, data::Raster{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Matrix{Union{Missing, Int64}}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata, Missing}, properties::DimensionalData.Dimensions.LookupArrays.NoMetadata)
   @ YAXArrays.Cubes ~/.julia/dev/YAXArrays/src/Cubes/Cubes.jl:130
 [4] yaxcreate(#unused#::Type{YAXArray}, data::Raster{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Matrix{Union{Missing, Int64}}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata, Missing}, dimnames::Tuple{Symbol, Symbol}, dimvals::Vector{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing}}, atts::DimensionalData.Dimensions.LookupArrays.NoMetadata)
   @ YAXArrays.Cubes ~/.julia/dev/YAXArrays/src/Cubes/Cubes.jl:322
 [5] yaxconvert(T::Type, x::DimArray{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Raster{Union{Missing, Int64}, 2, Tuple{X{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, X{Colon}}}, Y{Projected{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, DimensionalData.Dimensions.LookupArrays.ForwardOrdered, DimensionalData.Dimensions.LookupArrays.Regular{Float64}, DimensionalData.Dimensions.LookupArrays.Intervals{DimensionalData.Dimensions.LookupArrays.Start}, DimensionalData.Dimensions.LookupArrays.NoMetadata, Nothing, Nothing, Y{Colon}}}}, Tuple{}, Matrix{Union{Missing, Int64}}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata, Missing}, Symbol, DimensionalData.Dimensions.LookupArrays.NoMetadata})
   @ YAXArrayBase ~/.julia/dev/YAXArrayBase/src/axisarrays/axisinterface.jl:82
 [6] top-level scope
   @ REPL[58]:1

[meggart]

This would be quite simple to fix by making sure that yaxconvert always represents its attributes as a Dict.