Scopes are not processed when evaluating Join conditions

[systemmonkey42]

Playground Pull Request Link

https://github.com/go-gorm/playground/pull/743

Description

When using Joins/InnerJoins, there is an inconsistency about how the join clause is processed.

My application uses a number of preprepared filters, including some generated dynamically. When used as Scopes() for normal queries, they work fine, but when they are used as a clause in a Join() or InnerJoin() they are ignored

db.Find(&User{})

SELECT
    *
FROM
    `users`
WHERE
    `users`.`deleted_at` IS NULL

db.Joins("Group").Find(&User{})

SELECT
    `users`.`id`,
    `users`.`created_at`,
    `users`.`updated_at`,
    `users`.`deleted_at`,
    `users`.`name`,
    `users`.`group_id`,
    `Group`.`id` AS `Group__id`,
    `Group`.`created_at` AS `Group__created_at`,
    `Group`.`updated_at` AS `Group__updated_at`,
    `Group`.`deleted_at` AS `Group__deleted_at`,
    `Group`.`name` AS `Group__name`
FROM
    `users`
    LEFT JOIN `groups` `Group` ON `users`.`group_id` = `Group`.`id`
    AND `Group`.`deleted_at` IS NULL
WHERE
    `users`.`deleted_at` IS NULL

db.Joins("Group", db.Where(&Group{Model: &gorm.Model{ID: 2}})).Find(&User{})

Note the "AND Group.id = 2" - this is as expected.

SELECT
    `users`.`id`,
    `users`.`created_at`,
    `users`.`updated_at`,
    `users`.`deleted_at`,
    `users`.`name`,
    `users`.`group_id`,
    `Group`.`id` AS `Group__id`,
    `Group`.`created_at` AS `Group__created_at`,
    `Group`.`updated_at` AS `Group__updated_at`,
    `Group`.`deleted_at` AS `Group__deleted_at`,
    `Group`.`name` AS `Group__name`
FROM
    `users`
    LEFT JOIN `groups` `Group` ON `users`.`group_id` = `Group`.`id`
    AND (
        `Group`.`deleted_at` IS NULL
        AND `Group`.`id` = 2
    )
WHERE
    `users`.`deleted_at` IS NULL

GroupFilter := func(id uint) func(*gorm.DB) *gorm.DB {
    return func(db *gorm.DB) *gorm.DB {
        return db.Where(&Group{Model: &gorm.Model{ID: id}})
    }
}
db.Joins("Group", db.Scopes(GroupFilter(2))).Find(&User{})

In this case the parameter is checked, and isnt a simple "Where" clause, so it is ignored.

SELECT
    `users`.`id`,
    `users`.`created_at`,
    `users`.`updated_at`,
    `users`.`deleted_at`,
    `users`.`name`,
    `users`.`group_id`,
    `Group`.`id` AS `Group__id`,
    `Group`.`created_at` AS `Group__created_at`,
    `Group`.`updated_at` AS `Group__updated_at`,
    `Group`.`deleted_at` AS `Group__deleted_at`,
    `Group`.`name` AS `Group__name`
FROM
    `users`
    LEFT JOIN `groups` `Group` ON `users`.`group_id` = `Group`.`id`
    AND `Group`.`deleted_at` IS NULL
WHERE
    `users`.`deleted_at` IS NULL

If "chainable_api.go" included a call to db.executeScopes() before checking

    if where, ok := db.Statement.Clauses["WHERE"].Expression.(clause.Where); ok {
        j.On = &where
    }

This would work.

(Ps, I'm new to gorm playground, and I couldn't get past the gorm.io/gen/examples/dal: cannot find module providing package gorm.io/gen/examples/dal error)

Go playground test output

``` git clone --depth 1 -b master https://github.com/go-gorm/gorm.git Cloning into 'gorm'... remote: Enumerating objects: 180, done. remote: Counting objects: 100% (180/180), done. remote: Compressing objects: 100% (172/172), done. remote: Total 180 (delta 13), reused 52 (delta 6), pack-reused 0 Receiving objects: 100% (180/180), 233.63 KiB | 3.49 MiB/s, done. Resolving deltas: 100% (13/13), done. gorm.io/playground imports gorm.io/gen/examples/dal: cannot find module providing package gorm.io/gen/examples/dal ```

Sample Code

```go package main import ( "log" "os" "time" "gorm.io/driver/sqlite" "gorm.io/gorm" "gorm.io/gorm/logger" ) type User struct { *gorm.Model Name string GroupID uint Group Group } type Group struct { *gorm.Model Name string } func main() { dbDriver := sqlite.Open("test.db") db, _ := gorm.Open(dbDriver, &gorm.Config{}) err := db.AutoMigrate( &User{}, &Group{}, ) db = db.Debug() if err != nil { panic(err) } db.Find(&User{}) db.Joins("Group").Find(&User{}) db.Joins("Group", db.Where(&Group{Model: &gorm.Model{ID: 2}})).Find(&User{}) GroupFilter := func(id uint) func(*gorm.DB) *gorm.DB { return func(db *gorm.DB) *gorm.DB { return db.Where(&Group{Model: &gorm.Model{ID: id}}) } } db.Joins("Group", db.Scopes(GroupFilter(2))).Find(&User{}) } ```

Edit: formatting

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[systemmonkey42]

Added playground pull request go-gorm/playground#743

https://github.com/go-gorm/playground/pull/743