apollo-federation 2.14.2

Apollo Federation
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use crate::composition::ServiceDefinition;
use crate::composition::test_helpers::compose_as_fed2_subgraphs;

#[test]
fn type_subscription_appears_in_the_supergraph() {
    let subgraph_a = ServiceDefinition {
        name: "subgraphA",
        type_defs: r#"
                type Query {
                    me: User!
                }

                type Subscription {
                    onNewUser: User!
                }

                type User {
                    id: ID!
                    name: String!
                }
            "#,
    };

    let subgraph_b = ServiceDefinition {
        name: "subgraphB",
        type_defs: r#"
                type Query {
                    foo: Int
                }

                type Subscription {
                    bar: Int
                }
            "#,
    };

    let result = compose_as_fed2_subgraphs(&[subgraph_a, subgraph_b]).unwrap();
    let schema = result.schema().schema().to_string();
    assert!(
        schema.contains(r#"onNewUser: User! @join__field(graph: SUBGRAPHA)"#),
        "expected Subscription.onNewUser to be owned by SUBGRAPHA with a join directive; schema was:\n{}",
        schema
    );
}

#[test]
fn directives_incompatible_with_subscriptions_wont_compose() {
    let subgraph_a = ServiceDefinition {
        name: "subgraphA",
        type_defs: r#"
                type Query {
                    me: User!
                }

                type Subscription {
                    onNewUser: User! @shareable
                }

                type User {
                    id: ID!
                    name: String!
                }
            "#,
    };

    let subgraph_b = ServiceDefinition {
        name: "subgraphB",
        type_defs: r#"
                type Query {
                    foo: Int
                }

                type Subscription {
                    bar: Int
                }
            "#,
    };

    let errors = compose_as_fed2_subgraphs(&[subgraph_a, subgraph_b]).unwrap_err();
    assert_eq!(errors.len(), 1);
    let msg = errors.first().unwrap().to_string();
    assert_eq!(
        msg,
        "Fields on root level subscription object cannot be marked as shareable"
    );
}

#[test]
fn subscription_name_collisions_across_subgraphs_should_not_compose() {
    let subgraph_a = ServiceDefinition {
        name: "subgraphA",
        type_defs: r#"
                type Query {
                    me: User!
                }

                type Subscription {
                    onNewUser: User
                    foo: Int!
                }

                type User {
                    id: ID!
                    name: String!
                }
            "#,
    };

    let subgraph_b = ServiceDefinition {
        name: "subgraphB",
        type_defs: r#"
                type Query {
                    foo: Int
                }

                type Subscription {
                    foo: Int!
                }
            "#,
    };

    let errors = compose_as_fed2_subgraphs(&[subgraph_a, subgraph_b]).unwrap_err();
    assert_eq!(errors.len(), 1);
    let msg = errors.first().unwrap().to_string();
    assert_eq!(
        msg,
        "Non-shareable field \"Subscription.foo\" is resolved from multiple subgraphs: it is resolved from subgraphs \"subgraphA\" and \"subgraphB\" and defined as non-shareable in all of them"
    );
}