fix: fill schema defaults on current partial before diffing

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/fatih/color v1.19.0
 	github.com/google/go-cmp v0.7.0
 	github.com/kong/go-apiops v0.4.6
-	github.com/kong/go-database-reconciler v1.42.4
+	github.com/kong/go-database-reconciler v1.42.5-0.20260910123708-de3744ec50a3
 	github.com/kong/go-kong v0.78.0
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/spf13/cobra v1.10.2

go.sum

@@ -256,8 +256,8 @@ github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kong/go-apiops v0.4.6 h1:sQkTievX92AT5PZNZcUFbm7inysBVeZIIagXN8MWnP8=
 github.com/kong/go-apiops v0.4.6/go.mod h1:Xt99d90LallLVwYJAGaufiNbBdsK0KKboe7gR4Ryths=
-github.com/kong/go-database-reconciler v1.42.4 h1:CxeipG/dWIHi73bztg6BU7lIwotOKP1FUmfbz7sp6PE=
-github.com/kong/go-database-reconciler v1.42.4/go.mod h1:/lEPLhpDI1x+OOhQ+JeY3OsxvXYN04o12AmqzN7llRQ=
+github.com/kong/go-database-reconciler v1.42.5-0.20260910123708-de3744ec50a3 h1:lyOdsCUS4gDB4SOpzH2HZQT9qMP8k4iU6EVv+3SXDEE=
+github.com/kong/go-database-reconciler v1.42.5-0.20260910123708-de3744ec50a3/go.mod h1:/lEPLhpDI1x+OOhQ+JeY3OsxvXYN04o12AmqzN7llRQ=
 github.com/kong/go-kong v0.78.0 h1:VK5g26BCeF+l9o3j3pgU3BOuOdmTd9Vj33x29mKGtkg=
 github.com/kong/go-kong v0.78.0/go.mod h1:Wx5aTcMjyUnIF94M5NYFWb/EnuEkqB5STrWvybFSYYQ=
 github.com/kong/go-slugify v1.0.0 h1:vCFAyf2sdoSlBtLcrmDWUFn0ohlpKiKvQfXZkO5vSKY=

tests/integration/diff_test.go

@@ -1170,6 +1170,63 @@
 	assert.Equal(t, emptyOutput, out)
 }
 
+func Test_Diff_Partials_NoPerpetualDiff(t *testing.T) {
+	runWhenEnterpriseOrKonnect(t, ">=3.10.0")
+
+	isKonnect := os.Getenv("DECK_KONNECT_TOKEN") != ""
+
+	if isKonnect {
+		runDualTestWithSkipDefaults(t, "Test_Diff_Partials_NoPerpetualDiff", testDiffPartialsNoPerpetualDiffImpl)
+	} else {
+		testDiffPartialsNoPerpetualDiffImpl(t)
+	}
+}
+
+func testDiffPartialsNoPerpetualDiffImpl(t *testing.T) {
+	setup(t)
+	ctx := context.Background()
+
+	stateFile := "testdata/sync/039-partials/kong.yaml"
+
+	for i := range 2 {
+		require.NoError(t, sync(ctx, stateFile))
+
+		out, err := diff(stateFile)
+		require.NoError(t, err)
+		require.Equal(t, emptyOutput, out, "diff after sync %d reported changes", i+1)
+	}
+}
+
+func Test_Diff_Partials_RealChangeStillDetected(t *testing.T) {
+	runWhenEnterpriseOrKonnect(t, ">=3.10.0")
+
+	isKonnect := os.Getenv("DECK_KONNECT_TOKEN") != ""
+
+	if isKonnect {
+		runDualTestWithSkipDefaults(t, "Test_Diff_Partials_RealChangeStillDetected", testDiffPartialsRealChangeStillDetectedImpl)
+	} else {
+		testDiffPartialsRealChangeStillDetectedImpl(t)
+	}
+}
+
+func testDiffPartialsRealChangeStillDetectedImpl(t *testing.T) {
+	setup(t)
+	ctx := context.Background()
+
+	require.NoError(t, sync(ctx, "testdata/sync/039-partials/kong.yaml"))
+
+	out, err := diff("testdata/sync/039-partials/kong-update.yaml")
+	require.NoError(t, err)
+	assert.NotEqual(t, emptyOutput, out)
+	assert.Contains(t, out, "updating partial my-ee-partial")
+
+	require.NoError(t, sync(ctx, "testdata/sync/039-partials/kong-update.yaml"))
+
+	out, err = diff("testdata/sync/039-partials/kong-update.yaml")
+	require.NoError(t, err)
+	assert.Equal(t, emptyOutput, out)
+}
+
 func Test_Diff_Konnect_Workspace(t *testing.T) {
 	runWhenKonnect(t)
 	setup(t)