Code + comment cleanup for the entities

ref #39

src/models/entities/UserAction.ts

@@ -1,14 +1,17 @@
 import {
+  IsEnum,
   IsInt,
   IsNotEmpty,
   IsOptional,
   IsString
 } from "class-validator";
 import { Column, Entity, ManyToOne, PrimaryGeneratedColumn } from "typeorm";
+import { PermissionAction } from '../enums/PermissionAction';
 import { User } from './User';
 
 /**
- * Defines the UserAction interface.
+ * Defines the UserAction entity.
+ * Will later be used to document a user's actions.
 */
 @Entity()
 export class UserAction {
@@ -20,7 +23,7 @@ export class UserAction {
   id: number;
 
   /**
-   * user
+   * The user that performed the action.
    */
   @ManyToOne(() => User, user => user.actions)
   user: User
@@ -34,15 +37,16 @@ export class UserAction {
   target: string;
 
   /**
-   * The actions's action (e.g. UPDATE)
+   * The actions's action (e.g. UPDATE).
+   * Directly pulled from the PermissionAction Enum.
    */
-  @Column()
-  @IsNotEmpty()
-  @IsString()
-  action: string;
+  @Column({ type: 'varchar' })
+  @IsEnum(PermissionAction)
+  action: PermissionAction;
 
   /**
-   * The description of change (before-> after; e.g. distance:15->17)
+   * The description of the change (before-> after; e.g. distance:15->17).
+   * Will later be defined in more detail.
    */
   @Column({ nullable: true })
   @IsOptional()