Fix connect equations generation for array valued connectors

Author: YingboMa

src/systems/connectors.jl

@@ -350,8 +350,13 @@ end
 function generate_connection_equations_and_stream_connections(csets::AbstractVector{<:ConnectionSet})
     eqs = Equation[]
     stream_connections = ConnectionSet[]
+
     for cset in csets
-        vtype = get_connection_type(cset.set[1].v)
+        v = cset.set[1].v
+        if hasmetadata(v, Symbolics.GetindexParent)
+            v = getparent(v)
+        end
+        vtype = get_connection_type(v)
         if vtype === Stream
             push!(stream_connections, cset)
             continue

test/stream_connectors.jl

@@ -228,11 +228,11 @@ end
 
 @named simple = ODESystem([connect(vp1, vp2, vp3)], t)
 sys = expand_connections(compose(simple, [vp1, vp2, vp3]))
-@test equations(sys) == [
-                         vp1.v[1] ~ vp2.v[1]
-                         vp1.v[2] ~ vp2.v[2]
-                         vp1.v[1] ~ vp3.v[1]
-                         vp1.v[2] ~ vp3.v[2]
-                         0 ~ -vp1.i[1] - vp2.i[1] - vp3.i[1]
-                         0 ~ -vp1.i[2] - vp2.i[2] - vp3.i[2]
-                        ]
+@test sort(equations(sys), by=string) == sort([
+                          vp1.v[1] ~ vp2.v[1]
+                          vp1.v[2] ~ vp2.v[2]
+                          vp1.v[1] ~ vp3.v[1]
+                          vp1.v[2] ~ vp3.v[2]
+                          0 ~ -vp1.i[1] - vp2.i[1] - vp3.i[1]
+                          0 ~ -vp1.i[2] - vp2.i[2] - vp3.i[2]
+                        ], by=string)