Merge branch 'atrefz-get-id-attribute'

Author: paularmstrong

docs/api.md

@@ -179,6 +179,7 @@ You *do not* need to define any keys in your entity other than those that hold n
 
 * `define(definition)`: When used, the `definition` passed in will be merged with the original definition passed to the `Entity` constructor. This method tends to be useful for creating circular references in schema.
 * `key`: Returns the key provided to the constructor.
+* `idAttribute`: Returns the idAttribute provided to the constructor in options.
 
 #### Usage
 

src/__tests__/index.test.js

@@ -113,6 +113,7 @@ describe('normalize', () => {
     });
     expect(normalize({ user: { id: '456' } }, recommendation)).toMatchSnapshot();
     expect(idAttributeFn.mock.calls).toMatchSnapshot();
+    expect(recommendation.idAttribute).toBe(idAttributeFn);
   });
 
   it('passes over pre-normalized values', () => {

src/schemas/Entity.js

@@ -16,6 +16,7 @@ export default class EntitySchema {
 
     this._key = key;
     this._getId = typeof idAttribute === 'function' ? idAttribute : (input) => input[idAttribute];
+    this._idAttribute = idAttribute
     this._mergeStrategy = mergeStrategy;
     this._processStrategy = processStrategy;
     this.define(definition);
@@ -24,6 +25,10 @@ export default class EntitySchema {
   get key() {
     return this._key;
   }
+  
+  get idAttribute() {
+    return this._idAttribute
+  }
 
   define(definition) {
     this.schema = Object.keys(definition).reduce((entitySchema, key) => {