force AlignedMapping elements to be 2-dimensional

Also fixes reading files written with recent AnnData versions.
See scverse/anndata#1962

Author: ilia-kats

src/alignedmapping.jl

@@ -92,6 +92,9 @@ Base.pop!(d::AlignedMapping, k) = pop!(d.d, k)
 Base.pop!(d::AlignedMapping, k, default) = pop!(d.d, k, default)
 function Base.setindex!(d::AlignedMapping{T}, v::Union{AbstractArray, DataFrame}, k) where {T}
     checkdim(T, v, d.ref, k)
+    if ndims(v) == 1
+        v = reshape(v, :, 1)
+    end
     d.d[k] = v
 end
 Base.sizehint!(d::AlignedMapping, n) = sizehint!(d.d, n)

src/mudata.jl

@@ -465,7 +465,7 @@ function _update_attr!(mdata::MuData, attr::Symbol, axis::Integer, join_common::
         globaljoincols = Vector{String}()
         for mod in intersect(keys(getproperty(mdata, mapattr)), keys(mdata.mod))
             colname = mod * ":" * rowcol
-            globaldata[!, colname] = getproperty(mdata, mapattr)[mod]
+            globaldata[!, colname] = reshape(getproperty(mdata, mapattr)[mod], :)
             push!(globaljoincols, colname)
         end
         for col in globaljoincols