Merge pull request #104 from VirtualPlantLab/codepaths_merging_modell…

…ist_multiscale

Fix issue of overspecialisation of outputs Dict of variables requested by the user

src/mtg/save_results.jl

@@ -110,7 +110,12 @@ julia> collect(keys(preallocated_vars["Leaf"]))
 ```
 """
 function pre_allocate_outputs(statuses, statuses_template, reverse_multiscale_mapping, vars_need_init, outs, nsteps; type_promotion=nothing, check=true)
-    outs_ = copy(outs)
+    outs_ = Dict{String,Vector{Symbol}}()
+    for i in keys(outs) # i = "Plant"
+        @assert isa(outs[i], Tuple{Vararg{Symbol}}) """Outputs for scale $i should be a tuple of symbols, *e.g.* `"$i" => (:a, :b)`, found `"$i" => $(outs[i])` instead."""
+        outs_[i] = [outs[i]...]
+    end
+
     statuses_ = copy(statuses)
     # Checking that organs in outputs exist in the mtg (in the statuses):
     if !all(i in keys(statuses) for i in keys(outs_))
@@ -168,18 +173,20 @@ function pre_allocate_outputs(statuses, statuses_template, reverse_multiscale_ma
                     delete!(outs_, organ)
                 else
                     # Some still exist, we only use the ones that do:
-                    outs_[organ] = (existing_vars_requested...,)
+                    outs_[organ] = [existing_vars_requested...]
                 end
             end
         end
 
         if :node ∉ outs_[organ]
-            outs_[organ] = (outs_[organ]..., :node)
+            push!(outs_[organ], :node)
         end
     end
 
+    outs_tuple = Dict(i => Tuple(x for x in outs_[i]) for i in keys(outs_))
+
     # Making the pre-allocated outputs:
-    Dict(organ => Dict(var => [typeof(statuses_[organ][1][var])[] for n in 1:nsteps] for var in vars) for (organ, vars) in outs_)
+    Dict(organ => Dict(var => [typeof(statuses_[organ][1][var])[] for n in 1:nsteps] for var in vars) for (organ, vars) in outs_tuple)
     # Note: we use the type of the variable from the first status for each organ to pre-allocate the outputs, because they are
     # all the same type for others.
 end