Update docs

docs/en/src/SUMMARY.md

@@ -11,6 +11,7 @@
     - [Interface](define_interface.md)
     - [Union](define_union.md)
     - [InputObject](define_input_object.md)
+    - [Default value](default_value.md)
 - [Schema](define_schema.md)
     - [Query and Mutation](query_and_mutation.md)
     - [Subscription](subscription.md)

docs/en/src/custom_scalars.md

@@ -24,8 +24,8 @@ impl ScalarType for StringNumber {
         }
     }
 
-    fn to_json(&self) -> Result<serde_json::Value> {
-        Ok(serde_json::to_value(self.0).unwrap())
+    fn to_value(&self) -> Value {
+        Value::String(self.0.to_string())
     }
 }
 

docs/en/src/default_value.md

@@ -0,0 +1,60 @@
+# Default value
+
+You can define default values for input value types.
+The following shows how to define default values for different types.
+
+## Object field
+
+```rust
+use async_graphql::*;
+
+struct Query;
+
+fn my_default() -> i32 {
+    30
+}
+
+#[Object]
+impl Query {
+    // The default value of the value parameter is 0, it will call i32::default()
+    fn test1(&self, #[arg(default)] value: i32) {}
+    
+    // The default value of the value parameter is 10
+    fn test2(&self, #[arg(default = 10)] value: i32) {}
+
+    // The default value of the value parameter uses the return result of the my_default function, the value is 30.
+    fn test3(&self, #[arg(default_with = "my_default()")] value: i32) {}
+}
+```
+
+## Interface field
+
+```rust
+use async_graphql::*;
+
+#[Interface(
+    field(name = "test1", arg(name = "value", default)),
+    field(name = "test2", arg(name = "value", default = 10)),
+    field(name = "test3", arg(name = "value", default = "my_default()")),
+)]
+enum MyInterface {
+    MyObj(MyObj),
+}
+```
+
+## Input object field
+
+```rust
+use async_graphql::*;
+
+struct MyInputObject {
+    #[field(default)]
+    value1: i32,
+    
+    #[field(default = 10)]
+    value2: i32,
+
+    #[field(default = "my_default()")]
+    value3: i32,
+}
+```

docs/zh-CN/src/SUMMARY.md

@@ -11,6 +11,7 @@
     - [接口(Interface)](define_interface.md)
     - [联合(Union)](define_union.md)
     - [输入对象(InputObject)](define_input_object.md)
+    - [默认值](default_value.md)
 - [定义模式(Schema)](define_schema.md)
     - [查询和变更](query_and_mutation.md)
     - [订阅](subscription.md)

docs/zh-CN/src/custom_scalars.md

@@ -24,8 +24,8 @@ impl ScalarType for StringNumber {
         }
     }
 
-    fn to_json(&self) -> Result<serde_json::Value> {
-        Ok(serde_json::to_value(self.0).unwrap())
+    fn to_value(&self) -> Value {
+        Value::String(self.0.to_string())
     }
 }
 

docs/zh-CN/src/default_value.md

@@ -0,0 +1,59 @@
+# 默认值
+
+你可以为输入值类型定义默认值，下面展示了在不同类型上默认值的定义方法。
+
+## 对象字段参数
+
+```rust
+use async_graphql::*;
+
+struct Query;
+
+fn my_default() -> i32 {
+    30
+}
+
+#[Object]
+impl Query {
+    // value参数的默认值为0，它会调用i32::default()
+    fn test1(&self, #[arg(default)] value: i32) {}
+    
+    // value参数的默认值为10
+    fn test2(&self, #[arg(default = 10)] value: i32) {}
+
+    // value参数的默认值使用my_default函数的返回结果，值为30
+    fn test3(&self, #[arg(default_with = "my_default()")] value: i32) {}
+}
+```
+
+## 接口字段参数
+
+```rust
+use async_graphql::*;
+
+#[Interface(
+    field(name = "test1", arg(name = "value", default)),
+    field(name = "test2", arg(name = "value", default = 10)),
+    field(name = "test3", arg(name = "value", default = "my_default()")),
+)]
+enum MyInterface {
+    MyObj(MyObj),
+}
+```
+
+## 输入对象(InputObject)
+
+```rust
+use async_graphql::*;
+
+struct MyInputObject {
+    #[field(default)]
+    value1: i32,
+    
+    #[field(default = 10)]
+    value2: i32,
+
+    #[field(default = "my_default()")]
+    value3: i32,
+}
+```

docs/zh-CN/src/define_input_object.md

@@ -12,7 +12,7 @@ struct Coordinate {
     latitude: f64,
 
     #[field(desc = "...")]
-    longitude: f64
+    longitude: f64,
 }
 
 struct Mutation;