Essent · bosc0 · Apr 3, 2025 · Apr 3, 2025
diff --git a/docs/resources/usergroup.md b/docs/resources/usergroup.md
@@ -32,7 +32,7 @@ This resource requires the following scopes:
 - `channels` (List of String) Channels shared by the user group.
 - `description` (String)
 - `prevent_conflicts` (Boolean) If true, the plan fails if there's an enabled user group with the same name or handle.
-- `users` (List of String) List of user IDs in the user group.
+- `users` (Set of String) List of user IDs in the user group.
 
 ### Read-Only
 

diff --git a/internal/provider/resource_usergroup.go b/internal/provider/resource_usergroup.go
@@ -14,6 +14,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/booldefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/listdefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema/setdefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringdefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/types"
@@ -41,7 +42,7 @@ type UserGroupResourceModel struct {
 	Description      types.String `tfsdk:"description"`
 	Handle           types.String `tfsdk:"handle"`
 	Channels         types.List   `tfsdk:"channels"`
-	Users            types.List   `tfsdk:"users"`
+	Users            types.Set    `tfsdk:"users"`
 	PreventConflicts types.Bool   `tfsdk:"prevent_conflicts"`
 }
 
@@ -84,12 +85,12 @@ This resource requires the following scopes:
 					types.ListValueMust(types.StringType, []attr.Value{}),
 				),
 			},
-			"users": schema.ListAttribute{
+			"users": schema.SetAttribute{
 				ElementType: types.StringType,
 				Optional:    true,
 				Computed:    true,
-				Default: listdefault.StaticValue(
-					types.ListValueMust(types.StringType, []attr.Value{}),
+				Default: setdefault.StaticValue(
+					types.SetValueMust(types.StringType, []attr.Value{}),
 				),
 				Description: "List of user IDs in the user group.",
 			},

diff --git a/internal/provider/resource_usergroup_mock.go b/internal/provider/resource_usergroup_mock.go
@@ -55,7 +55,7 @@ func (b *UserGroupResourceModelBuilder) WithUsers(value []string) *UserGroupReso
 	for i, v := range value {
 		attrValues[i] = types.StringValue(v)
 	}
-	b.result.Users = types.ListValueMust(types.StringType, attrValues)
+	b.result.Users = types.SetValueMust(types.StringType, attrValues)
 
 	return b
 }

diff --git a/internal/provider/usergroup_service.go b/internal/provider/usergroup_service.go
@@ -51,7 +51,7 @@ func toPlan(m *UserGroupResourceModel) *UserGroupPlan {
 		Description:      m.Description.ValueString(),
 		Handle:           m.Handle.ValueString(),
 		Channels:         listToStringSlice(m.Channels),
-		Users:            listToStringSlice(m.Users),
+		Users:            setToStringSlice(m.Users),
 		PreventConflicts: m.PreventConflicts.ValueBool(),
 	}
 }

diff --git a/internal/provider/utils.go b/internal/provider/utils.go
@@ -23,6 +23,16 @@ func listToStringSlice(l types.List) []string {
 	return result
 }
 
+func setToStringSlice(s types.Set) []string {
+	res := make([]string, 0, len(s.Elements()))
+	for _, e := range s.Elements() {
+		if str, ok := e.(types.String); ok {
+			res = append(res, str.ValueString())
+		}
+	}
+	return res
+}
+
 func stringSliceToList(list []string) types.List {
 	if len(list) == 0 {
 		emptyVal, _ := types.ListValue(types.StringType, []attr.Value{})
@@ -39,11 +49,19 @@ func stringSliceToList(list []string) types.List {
 	return res
 }
 
+func stringSliceToSet(list []string) types.Set {
+	attrValues := make([]attr.Value, len(list))
+	for i, v := range list {
+		attrValues[i] = types.StringValue(v)
+	}
+	return types.SetValueMust(types.StringType, attrValues)
+}
+
 func (m *UserGroupResourceModel) UpdateFromUserGroup(ug *slack.UserGroup) {
 	m.ID = types.StringValue(ug.ID)
 	m.Name = types.StringValue(ug.Name)
 	m.Description = types.StringValue(ug.Description)
 	m.Handle = types.StringValue(ug.Handle)
 	m.Channels = stringSliceToList(ug.Prefs.Channels)
-	m.Users = stringSliceToList(ug.Users)
+	m.Users = stringSliceToSet(ug.Users)
 }