Objective expr and add tests

Author: Vaibhavdixit02

src/systems/optimization/optimizationsystem.jl

@@ -268,7 +268,7 @@ function DiffEqBase.OptimizationProblem{iip}(sys::OptimizationSystem, u0map,
     f = generate_function(sys, checkbounds = checkbounds, linenumbers = linenumbers,
         expression = Val{false})
 
-    obj_expr = toexpr(subs_constants(objective(sys)))
+    obj_expr = subs_constants(objective(sys))
 
     if grad
         grad_oop, grad_iip = generate_gradient(sys, checkbounds = checkbounds,

test/optimizationsystem.jl

@@ -283,3 +283,16 @@ end
 
     @test sol1.u ≈ sol2.u
 end
+
+@testset "#2323 keep symbolic exressions and xor condition on constraint bounds" begin
+    @variables x y
+    @parameters a b
+    loss = (a - x)^2 + b * (y - x^2)^2
+    @named sys = OptimizationSystem(loss, [x, y], [a, b], constraints = [x^2 + y^2 ≲ 0.0])
+    @test_throws ArgumentError OptimizationProblem(sys, [x => 0.0, y => 0.0], [a => 1.0, b => 100.0], lcons = [0.0])
+    @test_throws ArgumentError OptimizationProblem(sys, [x => 0.0, y => 0.0], [a => 1.0, b => 100.0], ucons = [0.0])
+
+    prob = OptimizationProblem(sys, [x => 0.0, y => 0.0], [a => 1.0, b => 100.0])
+    @test prob.f.expr isa Symbolics.Symbolic
+    @test all(prob.f.cons_expr[i].lhs isa Symbolics.Symbolic for i in 1:length(prob.f.cons_expr)) 
+end