fix: fix getguess for array variables

Author: AayushSabharwal

src/variables.jl

@@ -456,7 +456,7 @@ end
 ## Guess ======================================================================
 struct VariableGuess end
 Symbolics.option_to_metadata_type(::Val{:guess}) = VariableGuess
-getguess(x::Num) = getguess(Symbolics.unwrap(x))
+getguess(x::Union{Num, Symbolics.Arr}) = getguess(Symbolics.unwrap(x))
 
 """
     getguess(x)
@@ -469,8 +469,6 @@ Create variables with a guess like this
 ```
 """
 function getguess(x)
-    p = Symbolics.getparent(x, nothing)
-    p === nothing || (x = p)
     Symbolics.getmetadata(x, VariableGuess, nothing)
 end
 

test/test_variable_metadata.jl

@@ -16,6 +16,18 @@ using ModelingToolkit
 @test hasguess(y) === true
 @test ModelingToolkit.dump_variable_metadata(y).guess == 0
 
+# Issue#2653
+@variables y[1:3] [guess = ones(3)]
+@test getguess(y) == ones(3)
+@test hasguess(y) === true
+@test ModelingToolkit.dump_variable_metadata(y).guess == ones(3)
+
+for i in 1:3
+    @test getguess(y[i]) == 1.0
+    @test hasguess(y[i]) === true
+    @test ModelingToolkit.dump_variable_metadata(y[i]).guess == 1.0
+end
+
 @variables y
 @test hasguess(y) === false
 @test !haskey(ModelingToolkit.dump_variable_metadata(y), :guess)