Updated migrations field to be pointer (#639)

Author: ezilber-akamai

placement_groups.go

@@ -28,26 +28,25 @@ type PlacementGroupMember struct {
 
 // PlacementGroup represents a Linode placement group.
 type PlacementGroup struct {
-	ID                   int                      `json:"id"`
-	Label                string                   `json:"label"`
-	Region               string                   `json:"region"`
-	PlacementGroupType   PlacementGroupType       `json:"placement_group_type"`
-	PlacementGroupPolicy PlacementGroupPolicy     `json:"placement_group_policy"`
-	IsCompliant          bool                     `json:"is_compliant"`
-	Members              []PlacementGroupMember   `json:"members"`
-	Migrations           PlacementGroupMigrations `json:"migrations"`
+	ID                   int                       `json:"id"`
+	Label                string                    `json:"label"`
+	Region               string                    `json:"region"`
+	PlacementGroupType   PlacementGroupType        `json:"placement_group_type"`
+	PlacementGroupPolicy PlacementGroupPolicy      `json:"placement_group_policy"`
+	IsCompliant          bool                      `json:"is_compliant"`
+	Members              []PlacementGroupMember    `json:"members"`
+	Migrations           *PlacementGroupMigrations `json:"migrations"`
 }
 
 // PlacementGroupMigrations represent the instances that are being migrated to or from the placement group.
 type PlacementGroupMigrations struct {
-	Inbound []struct {
-		// The unique identifier for a compute instance being migrated into the placement group.
-		LinodeID int `json:"linode_id"`
-	} `json:"inbound"`
-	Outbound []struct {
-		// The unique identifier for a compute instance being migrated out of the placement group.
-		LinodeID int `json:"linode_id"`
-	} `json:"outbound"`
+	Inbound  []PlacementGroupMigrationInstance `json:"inbound"`
+	Outbound []PlacementGroupMigrationInstance `json:"outbound"`
+}
+
+// PlacementGroupMigrationInstance represents the unique identifier for a compute instance being migrated to/from the placement group.
+type PlacementGroupMigrationInstance struct {
+	LinodeID int `json:"linode_id"`
 }
 
 // PlacementGroupCreateOptions represents the options to use