nested object values can be computed

While blocks were not allowed to be computed by the provider, nested
objects can be. Remove the errors regarding blocks and verify unknown
values are valid.

internal/plans/objchange/plan_valid.go

@@ -39,11 +39,11 @@ func AssertPlanValid(schema *configschema.Block, priorState, config, plannedStat
 func assertPlanValid(schema *configschema.Block, priorState, config, plannedState cty.Value, path cty.Path) []error {
 	var errs []error
 	if plannedState.IsNull() && !config.IsNull() {
-		errs = append(errs, path.NewErrorf("planned for absense but config wants existence"))
+		errs = append(errs, path.NewErrorf("planned for absence but config wants existence"))
 		return errs
 	}
 	if config.IsNull() && !plannedState.IsNull() {
-		errs = append(errs, path.NewErrorf("planned for existence but config wants absense"))
+		errs = append(errs, path.NewErrorf("planned for existence but config wants absence"))
 		return errs
 	}
 	if plannedState.IsNull() {
@@ -286,6 +286,11 @@ func assertPlannedValueValid(attrS *configschema.Attribute, priorV, configV, pla
 			}
 			return errs
 		}
+	} else {
+		if attrS.Computed {
+			errs = append(errs, path.NewErrorf("configuration present for computed attribute"))
+			return errs
+		}
 	}
 
 	// If this attribute has a NestedType, validate the nested object
@@ -317,11 +322,11 @@ func assertPlannedObjectValid(schema *configschema.Object, prior, config, planne
 	var errs []error
 
 	if planned.IsNull() && !config.IsNull() {
-		errs = append(errs, path.NewErrorf("planned for absense but config wants existence"))
+		errs = append(errs, path.NewErrorf("planned for absence but config wants existence"))
 		return errs
 	}
 	if config.IsNull() && !planned.IsNull() {
-		errs = append(errs, path.NewErrorf("planned for existence but config wants absense"))
+		errs = append(errs, path.NewErrorf("planned for existence but config wants absence"))
 		return errs
 	}
 	if planned.IsNull() {
@@ -349,10 +354,6 @@ func assertPlannedObjectValid(schema *configschema.Object, prior, config, planne
 		for it := planned.ElementIterator(); it.Next(); {
 			idx, plannedEV := it.Element()
 			path := append(path, cty.IndexStep{Key: idx})
-			if !plannedEV.IsKnown() {
-				errs = append(errs, path.NewErrorf("element representing nested block must not be unknown itself; set nested attribute values to unknown instead"))
-				continue
-			}
 			if !config.HasIndex(idx).True() {
 				continue // should never happen since we checked the lengths above
 			}
@@ -387,16 +388,11 @@ func assertPlannedObjectValid(schema *configschema.Object, prior, config, planne
 		for k, plannedEV := range plannedVals {
 			configEV, ok := configVals[k]
 			if !ok {
-				errs = append(errs, path.NewErrorf("block key %q from plan is not present in config", k))
+				errs = append(errs, path.NewErrorf("map key %q from plan is not present in config", k))
 				continue
 			}
 			path := append(path, cty.GetAttrStep{Name: k})
 
-			if !plannedEV.IsKnown() {
-				errs = append(errs, path.NewErrorf("element representing nested block must not be unknown itself; set nested attribute values to unknown instead"))
-				continue
-			}
-
 			priorEV, ok := priorVals[k]
 			if !ok {
 				priorEV = cty.NullVal(schema.ImpliedType())
@@ -406,31 +402,22 @@ func assertPlannedObjectValid(schema *configschema.Object, prior, config, planne
 		}
 		for k := range configVals {
 			if _, ok := plannedVals[k]; !ok {
-				errs = append(errs, path.NewErrorf("block key %q from config is not present in plan", k))
+				errs = append(errs, path.NewErrorf("map key %q from config is not present in plan", k))
 				continue
 			}
 		}
 
 	case configschema.NestingSet:
+		plannedL := planned.LengthInt()
+		configL := config.LengthInt()
+		if plannedL != configL {
+			errs = append(errs, path.NewErrorf("count in plan (%d) disagrees with count in config (%d)", plannedL, configL))
+			return errs
+		}
 		// Because set elements have no identifier with which to correlate
-		// them, we can't robustly validate the plan for a nested block
+		// them, we can't robustly validate the plan for a nested object
 		// backed by a set, and so unfortunately we need to just trust the
-		// provider to do the right thing. :(
+		// provider to do the right thing.
-		//
-		// (In principle we could correlate elements by matching the
-		// subset of attributes explicitly set in config, except for the
-		// special diff suppression rule which allows for there to be a
-		// planned value that is constructed by mixing part of a prior
-		// value with part of a config value, creating an entirely new
-		// element that is not present in either prior nor config.)
-		for it := planned.ElementIterator(); it.Next(); {
-			idx, plannedEV := it.Element()
-			path := append(path, cty.IndexStep{Key: idx})
-			if !plannedEV.IsKnown() {
-				errs = append(errs, path.NewErrorf("element representing nested block must not be unknown itself; set nested attribute values to unknown instead"))
-				continue
-			}
-		}
 	}
 
 	return errs

internal/plans/objchange/plan_valid_test.go

@@ -1222,7 +1222,7 @@ func TestAssertPlanValid(t *testing.T) {
 			}),
 			[]string{`.bloop: planned value cty.ListVal([]cty.Value{cty.ObjectVal(map[string]cty.Value{"blop":cty.StringVal("ok")})}) for a non-computed attribute`},
 		},
-		"computed in nested objects": {
+		"computed within nested objects": {
 			&configschema.Block{
 				Attributes: map[string]*configschema.Attribute{
 					"map": {
@@ -1353,6 +1353,105 @@ func TestAssertPlanValid(t *testing.T) {
 			}),
 			nil,
 		},
+		"computed nested objects": {
+			&configschema.Block{
+				Attributes: map[string]*configschema.Attribute{
+					"map": {
+						NestedType: &configschema.Object{
+							Nesting: configschema.NestingMap,
+							Attributes: map[string]*configschema.Attribute{
+								"name": {
+									Type: cty.String,
+								},
+							},
+						},
+						Computed: true,
+					},
+					"list": {
+						NestedType: &configschema.Object{
+							Nesting: configschema.NestingList,
+							Attributes: map[string]*configschema.Attribute{
+								"name": {
+									Type: cty.String,
+								},
+							},
+						},
+						Computed: true,
+					},
+					"set": {
+						NestedType: &configschema.Object{
+							Nesting: configschema.NestingSet,
+							Attributes: map[string]*configschema.Attribute{
+								"name": {
+									Type: cty.String,
+								},
+							},
+						},
+						Computed: true,
+					},
+					"single": {
+						NestedType: &configschema.Object{
+							Nesting: configschema.NestingSingle,
+							Attributes: map[string]*configschema.Attribute{
+								"name": {
+									Type: cty.DynamicPseudoType,
+								},
+							},
+						},
+						Computed: true,
+					},
+				},
+			},
+			cty.NullVal(cty.Object(map[string]cty.Type{
+				"map": cty.Map(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				})),
+				"list": cty.List(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				})),
+				"set": cty.Set(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				})),
+				"single": cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				}),
+			})),
+			cty.ObjectVal(map[string]cty.Value{
+				"map": cty.NullVal(cty.Map(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				}))),
+				"list": cty.NullVal(cty.List(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				}))),
+				"set": cty.NullVal(cty.Set(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				}))),
+				"single": cty.NullVal(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				})),
+			}),
+			cty.ObjectVal(map[string]cty.Value{
+				"map": cty.MapVal(map[string]cty.Value{
+					"one": cty.UnknownVal(cty.Object(map[string]cty.Type{
+						"name": cty.String,
+					})),
+				}),
+				"list": cty.ListVal([]cty.Value{
+					cty.UnknownVal(cty.Object(map[string]cty.Type{
+						"name": cty.String,
+					})),
+				}),
+				"set": cty.SetVal([]cty.Value{
+					cty.UnknownVal(cty.Object(map[string]cty.Type{
+						"name": cty.String,
+					})),
+				}),
+				"single": cty.UnknownVal(cty.Object(map[string]cty.Type{
+					"name": cty.String,
+				})),
+			}),
+			nil,
+		},
 	}
 
 	for name, test := range tests {