mirror of
https://github.com/ent/ent.git
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4c3951d53b
Reviewed By: alexsn Differential Revision: D17050405 fbshipit-source-id: 85c41c92b15979b7aac8a6278a480cd593272f8a
91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"github.com/facebookincubator/ent/examples/m2m2types/ent/user"
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"github.com/facebookincubator/ent/examples/m2m2types/ent"
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"github.com/facebookincubator/ent/examples/m2m2types/ent/group"
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"github.com/facebookincubator/ent/dialect/sql"
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_ "github.com/mattn/go-sqlite3"
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)
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func main() {
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db, err := sql.Open("sqlite3", "file:o2o2types?mode=memory&cache=shared&_fk=1")
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if err != nil {
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log.Fatalf("failed opening connection to sqlite: %v", err)
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}
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defer db.Close()
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client := ent.NewClient(ent.Driver(db))
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ctx := context.Background()
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// run the auto migration tool.
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if err := client.Schema.Create(ctx); err != nil {
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log.Fatalf("failed creating schema resources: %v", err)
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}
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if err := Do(ctx, client); err != nil {
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log.Fatal(err)
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}
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}
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func Do(ctx context.Context, client *ent.Client) error {
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// Unlike `Save`, `SaveX` panics if an error occurs.
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hub := client.Group.
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Create().
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SetName("GitHub").
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SaveX(ctx)
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lab := client.Group.
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Create().
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SetName("GitLab").
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SaveX(ctx)
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a8m := client.User.
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Create().
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SetAge(30).
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SetName("a8m").
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AddGroups(hub, lab).
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SaveX(ctx)
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nati := client.User.
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Create().
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SetAge(28).
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SetName("nati").
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AddGroups(hub).
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SaveX(ctx)
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// Query the edges.
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groups, err := a8m.
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QueryGroups().
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All(ctx)
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if err != nil {
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return fmt.Errorf("querying a8m groups: %v", err)
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}
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fmt.Println(groups)
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// Output: [Group(id=1, name=GitHub) Group(id=2, name=GitLab)]
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groups, err = nati.
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QueryGroups().
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All(ctx)
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if err != nil {
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return fmt.Errorf("querying nati groups: %v", err)
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}
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fmt.Println(groups)
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// Output: [Group(id=1, name=GitHub)]
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// Traverse the graph.
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users, err := a8m.
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QueryGroups(). // [hub, lab]
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Where(group.Not(group.HasUsersWith(user.Name("nati")))). // [lab]
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QueryUsers(). // [a8m]
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QueryGroups(). // [hub, lab]
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QueryUsers(). // [a8m, nati]
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All(ctx)
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if err != nil {
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return fmt.Errorf("traversing the graph: %v", err)
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}
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fmt.Println(users)
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// Output: [User(id=1, age=30, name=a8m) User(id=2, age=28, name=nati)]
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return nil
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}
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