mirror of https://github.com/go-gorm/gorm.git
f06d6412de
When using `Preload` to include the results of a "has many"
relationship, Gorm previously returned an uninitialized slice for any
such relations that bore zero records. This distinction was most
apparent when the results were marshalled to a JSON representation--a
record with zero related records would be represented with `null`.
For example, consider the following schema:
id | name
---|------
1 | Lorin
2 | Sue
id | p_id | value
---|------|-------------------
1 | 1 | lorin@example.com
2 | 1 | lorin2@example.com
Querying with:
db.Preload("Email").Find(&people)
And marshalling the resulting value of `people` to JSON would yield the
following string:
[
{
"name": "Lorin",
"email": [
"lorin@example.com",
"lorin2@example.com"
]
},
{
"name": "Sue",
"email": null
}
]
Beyond being inconsistent, the value `null` in this response differs
semantically from the actual state of the database. The database
actually has zero related records for the second user, so a JSON value
of `[]` is appropriate.
Update the callback that processes "has many" relationships to
communicate empty query results with an empty slice.
|
||
|---|---|---|
| dialects | ||
| .codeclimate.yml | ||
| .gitignore | ||
| CONTRIBUTING.md | ||
| License | ||
| README.md | ||
| association.go | ||
| association_test.go | ||
| callback.go | ||
| callback_create.go | ||
| callback_delete.go | ||
| callback_query.go | ||
| callback_query_preload.go | ||
| callback_save.go | ||
| callback_system_test.go | ||
| callback_update.go | ||
| callbacks_test.go | ||
| create_test.go | ||
| customize_column_test.go | ||
| delete_test.go | ||
| dialect.go | ||
| dialect_common.go | ||
| dialect_mysql.go | ||
| dialect_postgres.go | ||
| dialect_sqlite3.go | ||
| embedded_struct_test.go | ||
| errors.go | ||
| field.go | ||
| field_test.go | ||
| interface.go | ||
| join_table_handler.go | ||
| join_table_test.go | ||
| logger.go | ||
| main.go | ||
| main_test.go | ||
| migration_test.go | ||
| model.go | ||
| model_struct.go | ||
| multi_primary_keys_test.go | ||
| pointer_test.go | ||
| polymorphic_test.go | ||
| preload_test.go | ||
| query_test.go | ||
| scaner_test.go | ||
| scope.go | ||
| scope_test.go | ||
| search.go | ||
| search_test.go | ||
| test_all.sh | ||
| update_test.go | ||
| utils.go | ||
| utils_test.go | ||
| wercker.yml | ||
README.md
GORM
The fantastic ORM library for Golang, aims to be developer friendly.
Overview
- Full-Featured ORM (almost)
- Associations (Has One, Has Many, Belongs To, Many To Many, Polymorphism)
- Callbacks (Before/After Create/Save/Update/Delete/Find)
- Preloading (eager loading)
- Transactions
- Composite Primary Key
- SQL Builder
- Auto Migrations
- Logger
- Extendable, write Plugins based on GORM callbacks
- Every feature comes with tests
- Developer Friendly
Getting Started
- GORM Guides jinzhu.github.com/gorm
Upgrading To V1.0
Author
jinzhu
Contributors
https://github.com/jinzhu/gorm/graphs/contributors
License
Released under the MIT License.