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dialect/sql: add neighbors function (#140)

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Summary:
Pull Request resolved: https://github.com/facebookincubator/ent/pull/140

This part of the effort of moving logic from Go templates to shared packages.
Next diffs will migrate the neighbors-set and predicates as well.

Dedicated tests for `sql/dialect/graph.go` will be added in a follow-up diff.

Reviewed By: alexsn

Differential Revision: D18304531

fbshipit-source-id: 93e9cf2636b5b4525eb27305bd2708122cfd6e40
This commit is contained in:
Ariel Mashraki
2019-11-05 13:07:38 -08:00
committed by Facebook Github Bot
parent a5d6a9e8b8
commit 930a17b767
17 changed files with 758 additions and 443 deletions
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48
examples/m2m2types/ent/client.go
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@@ -170,19 +170,17 @@ func (c *GroupClient) GetX(ctx context.Context, id int) *Group {
func (c *GroupClient) QueryUsers(gr *Group) *UserQuery {
query := &UserQuery{config: c.config}
id := gr.ID
builder := sql.Dialect(gr.driver.Dialect())
t1 := builder.Table(user.Table)
t2 := builder.Table(group.Table)
t3 := builder.Table(group.UsersTable)
t4 := builder.Select(t3.C(group.UsersPrimaryKey[1])).
From(t3).
Join(t2).
On(t3.C(group.UsersPrimaryKey[0]), t2.C(group.FieldID)).
Where(sql.EQ(t2.C(group.FieldID), id))
query.sql = builder.Select().
From(t1).
Join(t4).
On(t1.C(user.FieldID), t4.C(group.UsersPrimaryKey[1]))
step := &sql.Step{}
step.From.V = id
step.From.Table = group.Table
step.From.Column = group.FieldID
step.To.Table = user.Table
step.To.Column = user.FieldID
step.Edge.Rel = sql.M2M
step.Edge.Inverse = false
step.Edge.Table = group.UsersTable
step.Edge.Columns = append(step.Edge.Columns, group.UsersPrimaryKey...)
query.sql = sql.Neighbors(gr.driver.Dialect(), step)
return query
}
@@ -255,19 +253,17 @@ func (c *UserClient) GetX(ctx context.Context, id int) *User {
func (c *UserClient) QueryGroups(u *User) *GroupQuery {
query := &GroupQuery{config: c.config}
id := u.ID
builder := sql.Dialect(u.driver.Dialect())
t1 := builder.Table(group.Table)
t2 := builder.Table(user.Table)
t3 := builder.Table(user.GroupsTable)
t4 := builder.Select(t3.C(user.GroupsPrimaryKey[0])).
From(t3).
Join(t2).
On(t3.C(user.GroupsPrimaryKey[1]), t2.C(user.FieldID)).
Where(sql.EQ(t2.C(user.FieldID), id))
query.sql = builder.Select().
From(t1).
Join(t4).
On(t1.C(group.FieldID), t4.C(user.GroupsPrimaryKey[0]))
step := &sql.Step{}
step.From.V = id
step.From.Table = user.Table
step.From.Column = user.FieldID
step.To.Table = group.Table
step.To.Column = group.FieldID
step.Edge.Rel = sql.M2M
step.Edge.Inverse = true
step.Edge.Table = user.GroupsTable
step.Edge.Columns = append(step.Edge.Columns, user.GroupsPrimaryKey...)
query.sql = sql.Neighbors(u.driver.Dialect(), step)
return query
}