feat: implement default preset

Partially addresses coder/coder#18110

Signed-off-by: Danny Kopping <dannykopping@gmail.com>

Author: dannykopping

docs/data-sources/workspace_preset.md

@@ -27,6 +27,16 @@ data "coder_workspace_preset" "example" {
     (data.coder_parameter.ami.name)     = "ami-xxxxxxxx"
   }
 }
+
+# Example of a default preset that will be pre-selected for users
+data "coder_workspace_preset" "standard" {
+  name    = "Standard"
+  default = true
+  parameters = {
+    (data.coder_parameter.instance_type.name) = "t3.medium"
+    (data.coder_parameter.region.name)        = "us-west-2"
+  }
+}
 ```
 
 <!-- schema generated by tfplugindocs -->
@@ -38,6 +48,7 @@ data "coder_workspace_preset" "example" {
 
 ### Optional
 
+- `default` (Boolean) Whether this preset should be selected by default when creating a workspace. Only one preset per template can be marked as default.
 - `parameters` (Map of String) Workspace parameters that will be set by the workspace preset. For simple templates that only need prebuilds, you may define a preset with zero parameters. Because workspace parameters may change between Coder template versions, preset parameters are allowed to define values for parameters that do not exist in the current template version.
 - `prebuilds` (Block Set, Max: 1) Configuration for prebuilt workspaces associated with this preset. Coder will maintain a pool of standby workspaces based on this configuration. When a user creates a workspace using this preset, they are assigned a prebuilt workspace instead of waiting for a new one to build. See prebuilt workspace documentation [here](https://coder.com/docs/admin/templates/extending-templates/prebuilt-workspaces.md) (see [below for nested schema](#nestedblock--prebuilds))
 

examples/data-sources/coder_workspace_preset/data-source.tf

@@ -12,3 +12,13 @@ data "coder_workspace_preset" "example" {
     (data.coder_parameter.ami.name)     = "ami-xxxxxxxx"
   }
 }
+
+# Example of a default preset that will be pre-selected for users
+data "coder_workspace_preset" "standard" {
+  name    = "Standard"
+  default = true
+  parameters = {
+    (data.coder_parameter.instance_type.name) = "t3.medium"
+    (data.coder_parameter.region.name)        = "us-west-2"
+  }
+}

integration/test-data-source/main.tf

@@ -20,7 +20,8 @@ data "coder_parameter" "param" {
   icon        = "param icon"
 }
 data "coder_workspace_preset" "preset" {
-  name = "preset"
+  name    = "preset"
+  default = true
   parameters = {
     (data.coder_parameter.param.name) = "preset param value"
   }
@@ -53,6 +54,7 @@ locals {
     "workspace_parameter.value" : data.coder_parameter.param.value,
     "workspace_parameter.icon" : data.coder_parameter.param.icon,
     "workspace_preset.name" : data.coder_workspace_preset.preset.name,
+    "workspace_preset.default" : tostring(data.coder_workspace_preset.preset.default),
     "workspace_preset.parameters.param" : data.coder_workspace_preset.preset.parameters.param,
     "workspace_preset.prebuilds.instances" : tostring(one(data.coder_workspace_preset.preset.prebuilds).instances),
     "workspace_preset.prebuilds.expiration_policy.ttl" : tostring(one(one(data.coder_workspace_preset.preset.prebuilds).expiration_policy).ttl),

provider/workspace_preset.go

@@ -12,6 +12,7 @@ import (
 
 type WorkspacePreset struct {
 	Name       string            `mapstructure:"name"`
+	Default    bool              `mapstructure:"default"`
 	Parameters map[string]string `mapstructure:"parameters"`
 	// There should always be only one prebuild block, but Terraform's type system
 	// still parses them as a slice, so we need to handle it as such. We could use
@@ -68,6 +69,12 @@ func workspacePresetDataSource() *schema.Resource {
 				Required:     true,
 				ValidateFunc: validation.StringIsNotEmpty,
 			},
+			"default": {
+				Type:        schema.TypeBool,
+				Description: "Whether this preset should be selected by default when creating a workspace. Only one preset per template can be marked as default.",
+				Optional:    true,
+				Default:     false,
+			},
 			"parameters": {
 				Type:        schema.TypeMap,
 				Description: "Workspace parameters that will be set by the workspace preset. For simple templates that only need prebuilds, you may define a preset with zero parameters. Because workspace parameters may change between Coder template versions, preset parameters are allowed to define values for parameters that do not exist in the current template version.",

provider/workspace_preset_test.go

@@ -265,6 +265,62 @@ func TestWorkspacePreset(t *testing.T) {
 			}`,
 			ExpectError: regexp.MustCompile("An argument named \"invalid_argument\" is not expected here."),
 		},
+		{
+			Name: "Default field set to true",
+			Config: `
+			data "coder_workspace_preset" "preset_1" {
+				name = "preset_1"
+				default = true
+				parameters = {
+					"region" = "us-east1-a"
+				}
+			}`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				resource := state.Modules[0].Resources["data.coder_workspace_preset.preset_1"]
+				require.NotNil(t, resource)
+				require.Equal(t, resource.Primary.Attributes["default"], "true")
+				return nil
+			},
+		},
+		{
+			Name: "Default field set to false",
+			Config: `
+			data "coder_workspace_preset" "preset_1" {
+				name = "preset_1"
+				default = false
+				parameters = {
+					"region" = "us-east1-a"
+				}
+			}`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				resource := state.Modules[0].Resources["data.coder_workspace_preset.preset_1"]
+				require.NotNil(t, resource)
+				require.Equal(t, resource.Primary.Attributes["default"], "false")
+				return nil
+			},
+		},
+		{
+			Name: "Default field not provided (defaults to false)",
+			Config: `
+			data "coder_workspace_preset" "preset_1" {
+				name = "preset_1"
+				parameters = {
+					"region" = "us-east1-a"
+				}
+			}`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				resource := state.Modules[0].Resources["data.coder_workspace_preset.preset_1"]
+				require.NotNil(t, resource)
+				require.Equal(t, resource.Primary.Attributes["default"], "false")
+				return nil
+			},
+		},
 	}
 
 	for _, testcase := range testcases {