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fix(reflection): enhance GetForeignKeyColumn logic for self-referential models

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* Add support for self-referential models in GetForeignKeyColumn
* Update comments for clarity on foreign key resolution strategies
* Introduce selfRefItem struct for testing self-referential behavior
This commit is contained in:
Hein
2026-05-18 13:03:07 +02:00
parent c42fa11c1a
commit 4244e838b1
3 changed files with 71 additions and 11 deletions
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19
pkg/reflection/model_utils_foreign_key_test.go
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@@ -37,6 +37,17 @@ type gormCompositeEmployee struct {
Department *fkDept `gorm:"foreignKey:DeptID,TenantID" json:"department"`
}
// selfRefItem mimics a self-referential model (like mastertaskitem) where the
// parent PK column appears as the left side of a has-many join tag.
type selfRefItem struct {
RidItem int32 `json:"rid_item" bun:"rid_item,type:integer,pk"`
RidParentItem int32 `json:"rid_parentitem" bun:"rid_parentitem,type:integer"`
// has-one (single parent pointer)
Parent *selfRefItem `json:"Parent,omitempty" bun:"rel:has-one,join:rid_item=rid_parentitem"`
// has-many (child collection) — same join, duplicate right-side must be deduped
Children []*selfRefItem `json:"Children,omitempty" bun:"rel:has-many,join:rid_item=rid_parentitem"`
}
// conventionEmployee has no explicit FK tag — relies on naming convention.
type conventionEmployee struct {
DepartmentID string `json:"department_id"`
@@ -101,6 +112,14 @@ func TestGetForeignKeyColumn(t *testing.T) {
want: []string{"dept_id", "tenant_id"},
},
// Join left-side scan (parentKey is a raw column name, not a relation field name)
{
name: "self-referential: parent PK column returns child FK column",
modelType: reflect.TypeOf(selfRefItem{}),
parentKey: "rid_item",
want: []string{"rid_parentitem"},
},
// Pointer and slice unwrapping
{
name: "pointer to struct is unwrapped",