small fixes

sample/sample13-everywhere-abstraction/entity/BaseObject.ts

@@ -1,6 +1,8 @@
 import {PrimaryColumn, Column} from "../../../src/columns";
 import {AbstractTable} from "../../../src/decorator/tables/AbstractTable";
 import {BasePost} from "./BasePost";
+import {PostAuthor} from "./PostAuthor";
+import {ManyToOne} from "../../../src/decorator/relations/ManyToOne";
 
 @AbstractTable()
 export class BaseObject extends BasePost {
@@ -11,4 +13,11 @@ export class BaseObject extends BasePost {
     @Column()
     title: string;
 
+    @ManyToOne(type => PostAuthor, post => post.posts, {
+        cascadeInsert: true,
+        cascadeUpdate: true,
+        cascadeRemove: true
+    })
+    author: PostAuthor;
+
 }

sample/sample13-everywhere-abstraction/entity/Blog.ts

@@ -13,13 +13,6 @@ export class Blog extends BaseObject {
     @Column()
     text: string;
 
-    @ManyToOne(type => PostAuthor, post => post.posts, {
-        cascadeInsert: true,
-        cascadeUpdate: true,
-        cascadeRemove: true
-    })
-    author: PostAuthor;
-
     @ManyToMany(type => PostCategory, category => category.posts, {
         cascadeInsert: true,
         cascadeUpdate: true,

sample/sample13-everywhere-abstraction/entity/Post.ts

@@ -13,13 +13,6 @@ export class Post extends BaseObject {
     @Column()
     text: string;
 
-    @ManyToOne(type => PostAuthor, post => post.posts, {
-        cascadeInsert: true,
-        cascadeUpdate: true,
-        cascadeRemove: true
-    })
-    author: PostAuthor;
-
     @ManyToMany(type => PostCategory, category => category.posts, {
         cascadeInsert: true,
         cascadeUpdate: true,

src/metadata-storage/EntityMetadataValidator.ts

@@ -5,6 +5,7 @@ import {UsingJoinColumnOnlyOnOneSideAllowedError} from "./error/UsingJoinColumnO
 import {MissingJoinColumnError} from "./error/MissingJoinColumnError";
 import {MissingJoinTableError} from "./error/MissingJoinTableError";
 import {EntityMetadata} from "../metadata/EntityMetadata";
+import {MissingPrimaryColumnError} from "./error/MissingPrimaryColumnError";
 
 /**
  * Validates built entity metadatas.
@@ -17,16 +18,22 @@ export class EntityMetadataValidator {
     // Public Methods
     // -------------------------------------------------------------------------
 
+    /**
+     * Validates all given entity metadatas.
+     */
     validateMany(entityMetadatas: EntityMetadata[]) {
         entityMetadatas.forEach(entityMetadata => this.validate(entityMetadata));
     }
-    
+
+    /**
+     * Validates given entity metadata.
+     */
     validate(entityMetadata: EntityMetadata) {
 
         // check if table metadata has an id
         if (!entityMetadata.primaryColumn)
-            throw new Error(`Entity "${entityMetadata.name}" does not have a primary column. Primary column is required to have in all your entities. Use @PrimaryColumn decorator to add a primary column to your entity.`);
-
+            throw new MissingPrimaryColumnError(entityMetadata);
+        
         entityMetadata.relations.forEach(relation => {
 
             // check join tables:

src/metadata-storage/error/MissingPrimaryColumnError.ts

@@ -0,0 +1,15 @@
+import {EntityMetadata} from "../../metadata/EntityMetadata";
+
+/**
+ * @internal
+ */
+export class MissingPrimaryColumnError extends Error {
+    name = "MissingPrimaryColumnError";
+
+    constructor(entityMetadata: EntityMetadata) {
+        super();
+        this.message = `Entity "${entityMetadata.name}" does not have a primary column. Primary column is required to ` + 
+            `have in all your entities. Use @PrimaryColumn decorator to add a primary column to your entity.`;
+    }
+
+}