Support fragments in interfaces

Author: tomhoule

.editorconfig

@@ -1,6 +1,6 @@
 root = true
 
-[*]
+[*.rs]
 end_of_line = lf
 insert_final_newline = true
 charset = utf-8

tests/interfaces.rs

@@ -79,3 +79,20 @@ fn interface_not_on_everything_deserialization() {
 
     assert_eq!(response_data.everything.map(|names| names.len()), Some(4));
 }
+
+#[derive(GraphQLQuery)]
+#[graphql(
+    query_path = "tests/interfaces/interface_with_fragment_query.graphql",
+    schema_path = "tests/interfaces/interface_schema.graphql",
+    response_derives = "Debug",
+)]
+pub struct InterfaceWithFragmentQuery;
+
+const RESPONSE_FRAGMENT: &'static str =
+    include_str!("interfaces/interface_with_fragment_response.json");
+
+#[test]
+fn fragment_in_interface() {
+    let response_data: interface_with_fragment_query::ResponseData =
+        serde_json::from_str(RESPONSE_FRAGMENT).unwrap();
+}

tests/interfaces/interface_schema.graphql

@@ -1,35 +1,36 @@
 schema {
-  query: InterfaceQuery
+    query: InterfaceQuery
 }
 
 interface Named {
-  name: String!
+    name: String!
+    displayName: Boolean!
 }
 
 type Person implements Named {
-  name: String!
-  birthday: String
+    name: String!
+    birthday: String
 }
 
 enum Industry {
-  CHOCOLATE
-  OTHER
+    CHOCOLATE
+    OTHER
 }
 
 type Organization implements Named {
-  name: String
-  industry: Industry!
-  createdAt: String
+    name: String
+    industry: Industry!
+    createdAt: String
 }
 
 type Dog implements Named {
-  name: String!
-  """
-  Always returns true
-  """
-  isGoodDog: Boolean!
+    name: String!
+    """
+    Always returns true
+    """
+    isGoodDog: Boolean!
 }
 
 type InterfaceQuery {
-  everything: [Named!]
+    everything: [Named!]
 }

tests/interfaces/interface_with_fragment_query.graphql

@@ -0,0 +1,20 @@
+fragment PublicStatus on Named {
+    displayName
+}
+
+query MyQuery {
+    everything {
+        name
+        __typename
+        ...PublicStatus
+        ... on Dog {
+            isGoodDog
+        }
+        ... on Person {
+            birthday
+        }
+        ... on Organization {
+            industry
+        }
+    }
+}

tests/interfaces/interface_with_fragment_response.json

@@ -0,0 +1,28 @@
+{
+    "everything": [
+        {
+            "__typename": "Person",
+            "name": "Audrey Lorde",
+            "displayName": false,
+            "birthday": "1934-02-18"
+        },
+        {
+            "__typename": "Dog",
+            "name": "Laïka",
+            "displayName": true,
+            "isGoodDog": true
+        },
+        {
+            "__typename": "Organization",
+            "name": "Mozilla",
+            "displayName": false,
+            "industry": "OTHER"
+        },
+        {
+            "__typename": "Dog",
+            "name": "Norbert",
+            "displayName": true,
+            "isGoodDog": true
+        }
+    ]
+}