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
|
// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package main
import (
"context"
"fmt"
"log"
"github.com/facebook/ent/examples/m2mbidi/ent"
"github.com/facebook/ent/examples/m2mbidi/ent/user"
_ "github.com/mattn/go-sqlite3"
)
func Example_M2MBidi() {
client, err := ent.Open("sqlite3", "file:ent?mode=memory&cache=shared&_fk=1")
if err != nil {
log.Fatalf("failed opening connection to sqlite: %v", err)
}
defer client.Close()
ctx := context.Background()
// run the auto migration tool.
if err := client.Schema.Create(ctx); err != nil {
log.Fatalf("failed creating schema resources: %v", err)
}
if err := Do(ctx, client); err != nil {
log.Fatal(err)
}
// Output:
// [User(id=1, age=30, name=a8m)]
// [User(id=2, age=28, name=nati)]
// [User(id=1, age=30, name=a8m) User(id=2, age=28, name=nati)]
}
func Do(ctx context.Context, client *ent.Client) error {
// Unlike `Save`, `SaveX` panics if an error occurs.
a8m := client.User.
Create().
SetAge(30).
SetName("a8m").
SaveX(ctx)
nati := client.User.
Create().
SetAge(28).
SetName("nati").
AddFriends(a8m).
SaveX(ctx)
// Query friends. Unlike `All`, `AllX` panics if an error occurs.
friends := nati.
QueryFriends().
AllX(ctx)
fmt.Println(friends)
// Output: [User(id=1, age=30, name=a8m)]
friends = a8m.
QueryFriends().
AllX(ctx)
fmt.Println(friends)
// Output: [User(id=2, age=28, name=nati)]
// Query the graph:
friends = client.User.
Query().
Where(user.HasFriends()).
AllX(ctx)
fmt.Println(friends)
// Output: [User(id=1, age=30, name=a8m) User(id=2, age=28, name=nati)]
return nil
}
|
