[BAC-273] Stringify keys in from_json call

lib/active_model/entity/parsers/json.rb

@@ -14,11 +14,12 @@ def set_attribute_from_json(name, value)
         # Class-level methods.
         module ClassMethods
           def from_json(json)
+            unified_json = json.stringify_keys
             new.tap do |instance|
               instance.attributes.each_key do |name|
                 field_name = name.camelize(:lower)
 
-                instance.set_attribute_from_json(name, json[field_name])
+                instance.set_attribute_from_json(name, unified_json[field_name])
               end
             end
           end

spec/active_model/entity/parsers/json_spec.rb

@@ -120,4 +120,44 @@ class Person
       })
     end
   end
+
+  context "parsing symbolized json" do
+    let(:source) do
+      {
+        fieldObj: { x: 1 },
+        fieldBigInteger: 137,
+        fieldBoolean: false,
+        fieldDate: "2024-01-01",
+        fieldDatetime: "2024-01-01T01:03:07",
+        fieldFloat: 1.37,
+        fieldInteger: 138,
+        fieldString: "string",
+        fieldTime: "2024-02-03T01:03:08",
+        fieldRole: { fieldName: "nom", fieldNotMapped: "not_mapped", fieldPosition: { fieldName: "ceo" } },
+        fieldRoles: [{ fieldName: "prenom", fieldPositions: [{ fieldName: "cpo" }] }],
+        fieldIntegers: [1, 3, 7],
+        fieldNotMapped: "not_mapped"
+      }
+    end
+
+    it "loads an object" do
+      person = ParsersTest::Person.from_json(source)
+
+      expect(person).to be_valid
+      expect(person.as_json.deep_symbolize_keys).to eq({
+        field_obj: { x: 1 },
+        field_big_integer: 137,
+        field_boolean: false,
+        field_date: "2024-01-01",
+        field_datetime: "2024-01-01T01:03:07.000Z",
+        field_float: 1.37,
+        field_integer: 138,
+        field_string: "string",
+        field_time: "2000-01-01T01:03:08.000Z",
+        field_role: { field_name: "nom", field_position: { field_name: "ceo" }, field_positions: nil },
+        field_roles: [{ field_name: "prenom", field_position: nil, field_positions: [{ field_name: "cpo" }] }],
+        field_integers: [1, 3, 7]
+      })
+    end
+  end
 end