Implement type-refining fragments (fixes #154)

CHANGELOG.md

@@ -10,6 +10,40 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - The CLI can now optionally format the generated code with rustfmt (enable the `rustfmt` feature).
+- When deriving, the generated module now has the same visibility (private, `pub`, `pub(crate)` or `crate`) as the struct under derive.
+- Codegen now supports type-refining fragments, i.e. fragments on interfaces or unions that only apply to one of the variants. Example:
+
+  ```graphql
+  type Pie {
+    diameter: Integer
+    name: String
+  }
+
+  type Sandwich {
+    length: Float
+    ingredients: [String]
+  }
+
+  union Food = Sandwich | Pie
+
+  type Query {
+    lunch: Food
+  }
+
+  fragment PieName on Pie {
+    name
+  }
+
+  query Test {
+    lunch {
+      ...PieName
+      ...on Sandwich {
+        length
+      }
+    }
+  }
+
+  ```
 
 ### Changed
 

graphql_client/tests/interfaces.rs

@@ -11,7 +11,7 @@ const RESPONSE: &'static str = include_str!("interfaces/interface_response.json"
 #[graphql(
     query_path = "tests/interfaces/interface_query.graphql",
     schema_path = "tests/interfaces/interface_schema.graphql",
-    response_derives = "Debug, PartialEq",
+    response_derives = "Debug, PartialEq"
 )]
 pub struct InterfaceQuery;
 
@@ -50,15 +50,13 @@ fn interface_deserialization() {
     };
 
     assert_eq!(response_data, expected);
-
-    assert_eq!(response_data.everything.map(|names| names.len()), Some(4));
 }
 
 #[derive(GraphQLQuery)]
 #[graphql(
     query_path = "tests/interfaces/interface_not_on_everything_query.graphql",
     schema_path = "tests/interfaces/interface_schema.graphql",
-    response_derives = "Debug",
+    response_derives = "Debug"
 )]
 pub struct InterfaceNotOnEverythingQuery;
 
@@ -84,7 +82,7 @@ fn interface_not_on_everything_deserialization() {
 #[graphql(
     query_path = "tests/interfaces/interface_with_fragment_query.graphql",
     schema_path = "tests/interfaces/interface_schema.graphql",
-    response_derives = "Debug,PartialEq",
+    response_derives = "Debug,PartialEq"
 )]
 pub struct InterfaceWithFragmentQuery;
 
@@ -101,35 +99,37 @@ fn fragment_in_interface() {
         response_data,
         ResponseData {
             everything: Some(vec![
-                RustMyQueryEverything {
+                RustInterfaceWithFragmentQueryEverything {
                     name: "Audrey Lorde".to_string(),
                     public_status: PublicStatus {
                         display_name: false,
                     },
-                    on: RustMyQueryEverythingOn::Person(RustMyQueryEverythingOnPerson {
-                        birthday: Some("1934-02-18".to_string()),
-                    })
+                    on: RustInterfaceWithFragmentQueryEverythingOn::Person(
+                        RustInterfaceWithFragmentQueryEverythingOnPerson {
+                            birthday: Some("1934-02-18".to_string()),
+                        }
+                    )
                 },
-                RustMyQueryEverything {
+                RustInterfaceWithFragmentQueryEverything {
                     name: "Laïka".to_string(),
                     public_status: PublicStatus { display_name: true },
-                    on: RustMyQueryEverythingOn::Dog(RustMyQueryEverythingOnDog {
-                        is_good_dog: true,
-                    })
+                    on: RustInterfaceWithFragmentQueryEverythingOn::Dog(
+                        RustInterfaceWithFragmentQueryEverythingOnDog { is_good_dog: true }
+                    )
                 },
-                RustMyQueryEverything {
+                RustInterfaceWithFragmentQueryEverything {
                     name: "Mozilla".to_string(),
                     public_status: PublicStatus {
                         display_name: false
                     },
-                    on: RustMyQueryEverythingOn::Organization,
+                    on: RustInterfaceWithFragmentQueryEverythingOn::Organization,
                 },
-                RustMyQueryEverything {
+                RustInterfaceWithFragmentQueryEverything {
                     name: "Norbert".to_string(),
                     public_status: PublicStatus { display_name: true },
-                    on: RustMyQueryEverythingOn::Dog(RustMyQueryEverythingOnDog {
-                        is_good_dog: true
-                    }),
+                    on: RustInterfaceWithFragmentQueryEverythingOn::Dog(
+                        RustInterfaceWithFragmentQueryEverythingOnDog { is_good_dog: true }
+                    ),
                 },
             ])
         }

graphql_client/tests/interfaces/interface_with_fragment_query.graphql

@@ -2,10 +2,10 @@ fragment PublicStatus on Named {
   displayName
 }
 
-query MyQuery {
+query InterfaceWithFragmentQuery {
   everything {
-    name
     __typename
+    name
     ...PublicStatus
     ... on Dog {
       isGoodDog

graphql_client/tests/interfaces/interface_with_type_refining_fragment_query.graphql

@@ -0,0 +1,17 @@
+fragment Birthday on Person {
+  birthday
+}
+
+query MyQuery {
+  everything {
+    __typename
+    name
+    ... on Dog {
+      isGoodDog
+    }
+    ...Birthday
+    ... on Organization {
+      industry
+    }
+  }
+}

graphql_client/tests/type_refining_fragments.rs

@@ -0,0 +1,87 @@
+#[macro_use]
+extern crate graphql_client;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde;
+extern crate serde_json;
+
+#[derive(GraphQLQuery)]
+#[graphql(
+    query_path = "tests/interfaces/interface_with_type_refining_fragment_query.graphql",
+    schema_path = "tests/interfaces/interface_schema.graphql",
+    response_derives = "Debug, PartialEq"
+)]
+pub struct QueryOnInterface;
+
+#[derive(GraphQLQuery)]
+#[graphql(
+    query_path = "tests/unions/type_refining_fragment_on_union_query.graphql",
+    schema_path = "tests/unions/union_schema.graphql",
+    response_derives = "PartialEq, Debug"
+)]
+pub struct QueryOnUnion;
+
+#[test]
+fn type_refining_fragment_on_union() {
+    const RESPONSE: &'static str = include_str!("unions/union_query_response.json");
+
+    let response_data: query_on_union::ResponseData = serde_json::from_str(RESPONSE).unwrap();
+
+    let expected = query_on_union::ResponseData {
+        names: Some(vec![
+            query_on_union::RustMyQueryNames::Person(query_on_union::RustMyQueryNamesOnPerson {
+                first_name: "Audrey".to_string(),
+                last_name: Some("Lorde".to_string()),
+            }),
+            query_on_union::RustMyQueryNames::Dog(query_on_union::RustMyQueryNamesOnDog {
+                name: "Laïka".to_string(),
+            }),
+            query_on_union::RustMyQueryNames::Organization(
+                query_on_union::RustMyQueryNamesOnOrganization {
+                    title: "Mozilla".to_string(),
+                },
+            ),
+            query_on_union::RustMyQueryNames::Dog(query_on_union::RustMyQueryNamesOnDog {
+                name: "Norbert".to_string(),
+            }),
+        ]),
+    };
+
+    assert_eq!(response_data, expected);
+}
+
+#[test]
+fn type_refining_fragment_on_interface() {
+    use query_on_interface::*;
+
+    const RESPONSE: &'static str = include_str!("interfaces/interface_response.json");
+
+    let response_data: query_on_interface::ResponseData = serde_json::from_str(RESPONSE).unwrap();
+
+    let expected = ResponseData {
+        everything: Some(vec![
+            RustMyQueryEverything {
+                name: "Audrey Lorde".to_string(),
+                on: RustMyQueryEverythingOn::Person(RustMyQueryEverythingOnPerson {
+                    birthday: Some("1934-02-18".to_string()),
+                }),
+            },
+            RustMyQueryEverything {
+                name: "Laïka".to_string(),
+                on: RustMyQueryEverythingOn::Dog(RustMyQueryEverythingOnDog { is_good_dog: true }),
+            },
+            RustMyQueryEverything {
+                name: "Mozilla".to_string(),
+                on: RustMyQueryEverythingOn::Organization(RustMyQueryEverythingOnOrganization {
+                    industry: Industry::OTHER,
+                }),
+            },
+            RustMyQueryEverything {
+                name: "Norbert".to_string(),
+                on: RustMyQueryEverythingOn::Dog(RustMyQueryEverythingOnDog { is_good_dog: true }),
+            },
+        ]),
+    };
+
+    assert_eq!(response_data, expected);
+}

graphql_client/tests/unions/type_refining_fragment_on_union_query.graphql

@@ -0,0 +1,17 @@
+fragment DogName on Dog {
+  name
+}
+
+query MyQuery {
+  names {
+    __typename
+    ...DogName
+    ... on Person {
+      firstName
+      lastName
+    }
+    ... on Organization {
+      title
+    }
+  }
+}