new chinese translation

docs/guide-zh-CN/rest-resources.md

-Resources
 资源
 =========
 
-RESTful APIs are all about accessing and manipulating *resources*. You may view resources as
-[models](structure-models.md) in the MVC paradigm.
 RESTful 的 API 都是关于访问和操作 *资源*，可将资源看成MVC模式中的
 [模型](structure-models.md)
 
-While there is no restriction in how to represent a resource, in Yii you usually would represent resources
-in terms of objects of [[yii\base\Model]] or its child classes (e.g. [[yii\db\ActiveRecord]]), for the
-following reasons:
 在如何代表一个资源没有固定的限定，在Yii中通常使用 [[yii\base\Model]] 或它的子类（如 [[yii\db\ActiveRecord]]）
 代表资源，是为以下原因：
 
-* [[yii\base\Model]] implements the [[yii\base\Arrayable]] interface, which allows you to
-  customize how you want to expose resource data through RESTful APIs.
 * [[yii\base\Model]] 实现了 [[yii\base\Arrayable]] 接口，它允许你通过RESTful API自定义你想要公开的资源数据。
-* [[yii\base\Model]] supports [input validation](input-validation.md), which is useful if your RESTful APIs
-  need to support data input.
 * [[yii\base\Model]] 支持 [输入验证](input-validation.md), 在你的RESTful API需要支持数据输入时非常有用。
-* [[yii\db\ActiveRecord]] provides powerful DB data access and manipulation support, which makes it
-  a perfect fit if your resource data is stored in databases.
 * [[yii\db\ActiveRecord]] 提供了强大的数据库访问和操作方面的支持，如资源数据需要存到数据库它提供了完美的支持。
 
-In this section, we will mainly describe how a resource class extending from [[yii\base\Model]] (or its child classes)
-can specify what data may be returned via RESTful APIs. If the resource class does not extend from [[yii\base\Model]],
-then all its public member variables will be returned.
 本节主要描述资源类如何从 [[yii\base\Model]] (或它的子类) 继承并指定哪些数据可通过RESTful API返回，如果资源类没有
 继承 [[yii\base\Model]] 会将它所有的公开成员变量返回。
 
 
-## Fields <a name="fields"></a>
 ## 字段 <a name="fields"></a>
 
-When including a resource in a RESTful API response, the resource needs to be serialized into a string.
-Yii breaks this process into two steps. First, the resource is converted into an array by [[yii\rest\Serializer]].
-Second, the array is serialized into a string in a requested format (e.g. JSON, XML) by
-[[yii\web\ResponseFormatterInterface|response formatters]]. The first step is what you should mainly focus when
-developing a resource class.
 当RESTful API响应中包含一个资源时，该资源需要序列化成一个字符串。
 Yii将这个过程分成两步，首先，资源会被[[yii\rest\Serializer]]转换成数组，
 然后，该数组会通过[[yii\web\ResponseFormatterInterface|response formatters]]根据请求格式(如JSON, XML)被序列化成字符串。
 当开发一个资源类时应重点关注第一步。
 
-By overriding [[yii\base\Model::fields()|fields()]] and/or [[yii\base\Model::extraFields()|extraFields()]],
-you may specify what data, called *fields*, in the resource can be put into its array representation.
-The difference between these two methods is that the former specifies the default set of fields which should
-be included in the array representation, while the latter specifies additional fields which may be included
-in the array if an end user requests for them via the `expand` query parameter. For example,
 通过覆盖 [[yii\base\Model::fields()|fields()]] 和/或 [[yii\base\Model::extraFields()|extraFields()]] 方法,
 可指定资源中称为 *字段* 的数据放入展现数组中，两个方法的差别为前者指定默认包含到展现数组的字段集合，
 后者指定由于终端用户的请求包含 `expand` 参数哪些额外的字段应被包含到展现数组，例如，
 
 
 ```
-// returns all fields as declared in fields()
-http://localhost/users
-
-// only returns field id and email, provided they are declared in fields()
-http://localhost/users?fields=id,email
-
-// returns all fields in fields() and field profile if it is in extraFields()
-http://localhost/users?expand=profile
-
-// only returns field id, email and profile, provided they are in fields() and extraFields()
-http://localhost/users?fields=id,email&expand=profile
-```
-```
 // 返回fields()方法中申明的所有字段
 http://localhost/users
 
@@ -81,19 +42,11 @@ http://localhost/users?fields=id,email&expand=profile
 ```
 
 
-### Overriding `fields()` <a name="overriding-fields"></a>
 ### 覆盖 `fields()` 方法 <a name="overriding-fields"></a>
 
-By default, [[yii\base\Model::fields()]] returns all model attributes as fields, while
-[[yii\db\ActiveRecord::fields()]] only returns the attributes which have been populated from DB.
 [[yii\base\Model::fields()]] 默认返回模型的所有属性作为字段，
 [[yii\db\ActiveRecord::fields()]] 只返回和数据表关联的属性作为字段。
 
-You can override `fields()` to add, remove, rename or redefine fields. The return value of `fields()`
-should be an array. The array keys are the field names, and the array values are the corresponding
-field definitions which can be either property/attribute names or anonymous functions returning the
-corresponding field values. In the special case when a field name is the same as its defining attribute
-name, you can omit the array key. For example,
 可覆盖 `fields()` 方法来增加、删除、重命名、重定义字段，`fields()` 的返回值应为数组，数组的键为字段名
 数组的值为对应的字段定义，可为属性名或返回对应的字段值的匿名函数，特殊情况下，如果字段名和属性名相同，
 可省略数组的键，例如
@@ -126,24 +79,14 @@ public function fields()
 }
 ```
 
-> Warning: Because by default all attributes of a model will be included in the API result, you should
-> examine your data to make sure they do not contain sensitive information. If there is such information,
-> you should override `fields()` to filter them out. In the above example, we choose
-> to filter out `auth_key`, `password_hash` and `password_reset_token`.
 > 警告: 模型的所有属性默认会被包含到API结果中，应检查数据确保没包含敏感数据，如果有敏感数据，
 > 应覆盖`fields()`过滤掉，在上述例子中，我们选择过滤掉 `auth_key`, `password_hash` 和 `password_reset_token`.
 
 
-### Overriding `extraFields()` <a name="overriding-extra-fields"></a>
 ### 覆盖 `extraFields()` 方法 <a name="overriding-extra-fields"></a>
 
-By default, [[yii\base\Model::extraFields()]] returns nothing, while [[yii\db\ActiveRecord::extraFields()]]
-returns the names of the relations that have been populated from DB.
 [[yii\base\Model::extraFields()]] 默认返回空值，[[yii\db\ActiveRecord::extraFields()]] 返回和数据表关联的属性。
 
-The return data format of `extraFields()` is the same as that of `fields()`. Usually, `extraFields()`
-is mainly used to specify fields whose values are objects. For example, given the following field
-declaration,
 `extraFields()` 返回的数据格式和 `fields()` 相同，一般`extraFields()` 主要用于指定哪些值为对象的字段，
 例如，给定以下字段申明
 
@@ -176,7 +119,6 @@ public function extraFields()
 ```
 
 
-## Links <a name="links"></a>
 ## 链接 <a name="links"></a>
 
 [HATEOAS](http://en.wikipedia.org/wiki/HATEOAS), 是Hypermedia as the Engine of Application State的缩写,
@@ -216,15 +158,10 @@ class User extends ActiveRecord implements Linkable
 ```
 
 
-## Collections <a name="collections"></a>
 ## 集合 <a name="collections"></a>
 
 资源对象可以组成 *集合*，每个集合包含一组相同类型的资源对象。
 
-While collections can be represented as arrays, it is usually more desirable to represent them
-as [data providers](output-data-providers.md). This is because data providers support sorting and pagination
-of resources, which is a commonly needed feature for RESTful APIs returning collections. For example,
-the following action returns a data provider about the post resources:
 集合可被展现成数组，更多情况下展现成 [data providers](output-data-providers.md). 
 因为data providers支持资源的排序和分页，这个特性在 RESTful API 返回集合时也用到，例如This is because data providers support sorting and pagination
 如下操作返回post资源的data provider:
@@ -250,16 +187,10 @@ class PostController extends Controller
 当在RESTful API响应中发送data provider 时， [[yii\rest\Serializer]] 会取出资源的当前页并组装成资源对象数组，
 [[yii\rest\Serializer]] 也通过如下HTTP头包含页码信息：
 
-* `X-Pagination-Total-Count`: The total number of resources;
-* `X-Pagination-Page-Count`: The number of pages;
-* `X-Pagination-Current-Page`: The current page (1-based);
-* `X-Pagination-Per-Page`: The number of resources in each page;
-* `Link`: A set of navigational links allowing client to traverse the resources page by page.
 * `X-Pagination-Total-Count`: 资源所有数量;
 * `X-Pagination-Page-Count`: 页数;
 * `X-Pagination-Current-Page`: 当前页(从1开始);
 * `X-Pagination-Per-Page`: 每页资源数量;
 * `Link`: 允许客户端一页一页遍历资源的导航链接集合.
 
-An example may be found in the [Quick Start](rest-quick-start.md#trying-it-out) section.
 可在[快速入门](rest-quick-start.md#trying-it-out) 一节中找到样例.