How do I enable and disable UseStateForUnknown plan modifier conditionally

Terraform Providers Plugin Development
1

This is a part of my schema:

			"extensions": schema.SingleNestedAttribute{
				Description: "Extensions configuration for the database.",
				Computed:    true,
				Optional:    true,
				Attributes: map[string]schema.Attribute{
					"auto_manage": schema.BoolAttribute{Computed: true, Optional: true},
					"available": schema.ListAttribute{
						Computed:    true,
						ElementType: types.StringType,
						PlanModifiers: []planmodifier.List{
							listplanmodifier.UseStateForUnknown(),
						},
					},
					"requested": schema.ListAttribute{Computed: true, Optional: true, ElementType: types.StringType},
				},
			},
			"nodes": schema.ListNestedAttribute{
				Description: "List of nodes in the database.",
				Computed:    true,
				Optional:    true,
				PlanModifiers: []planmodifier.List{
					listplanmodifier.UseStateForUnknown(),
				},
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"name": schema.StringAttribute{
							Computed: true,
							Optional: true,
						},
						"connection": schema.SingleNestedAttribute{
							Computed: true,
							PlanModifiers: []planmodifier.Object{
								objectplanmodifier.UseStateForUnknown(),
							},
							Attributes: map[string]schema.Attribute{
								"database":            schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"host":                schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"password":            schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"port":                schema.Int64Attribute{Computed: true, PlanModifiers: []planmodifier.Int64{int64planmodifier.UseStateForUnknown()}},
								"username":            schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"external_ip_address": schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"internal_ip_address": schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"internal_host":       schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
							},
						},
						"location": schema.SingleNestedAttribute{
							Computed: true,
							PlanModifiers: []planmodifier.Object{
								objectplanmodifier.UseStateForUnknown(),
							},
							Attributes: map[string]schema.Attribute{
								"code":        schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"country":     schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"latitude":    schema.Float64Attribute{Computed: true, PlanModifiers: []planmodifier.Float64{float64planmodifier.UseStateForUnknown()}},
								"longitude":   schema.Float64Attribute{Computed: true, PlanModifiers: []planmodifier.Float64{float64planmodifier.UseStateForUnknown()}},
								"name":        schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"region":      schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"region_code": schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"timezone":    schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"postal_code": schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"metro_code":  schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"city":        schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
							},
						},
						"region": schema.SingleNestedAttribute{
							Computed: true,
							PlanModifiers: []planmodifier.Object{
								objectplanmodifier.UseStateForUnknown(),
							},
							Attributes: map[string]schema.Attribute{
								"active":             schema.BoolAttribute{Computed: true, PlanModifiers: []planmodifier.Bool{boolplanmodifier.UseStateForUnknown()}},
								"availability_zones": schema.ListAttribute{Computed: true, ElementType: types.StringType, PlanModifiers: []planmodifier.List{listplanmodifier.UseStateForUnknown()}},
								"cloud":              schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"code":               schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"name":               schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
								"parent":             schema.StringAttribute{Computed: true, PlanModifiers: []planmodifier.String{stringplanmodifier.UseStateForUnknown()}},
							},
						},
						"nodeextensions": schema.SingleNestedAttribute{
							Computed: true,
							PlanModifiers: []planmodifier.Object{
								objectplanmodifier.UseStateForUnknown(),
							},
							Attributes: map[string]schema.Attribute{
								"errors":    schema.MapAttribute{Computed: true, ElementType: types.StringType, PlanModifiers: []planmodifier.Map{mapplanmodifier.UseStateForUnknown()}},
								"installed": schema.ListAttribute{Computed: true, ElementType: types.StringType, PlanModifiers: []planmodifier.List{listplanmodifier.UseStateForUnknown()}},
							},
						},
					},
				},
			},

In here the nodeextentions will only update if the extensions gets modified otherwise it should be the same as the state. But as im using UseStateForUnknown im not sure how I can make it work exceptionally during this case.

2

Hi @KnockOutEZ :wave:t6:,
You can define your own attribute or resource-level plan modifier that can conditionally set the prior state. There’s an example implementation of the UseStateForUnknown plan modifier in the framework’s plan modification documentation, that you can use as a starting point for the implementation.