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Jinzhu 2018-02-10 22:21:46 +08:00
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advanced.html
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@ -851,7 +851,7 @@ db.SetLogger(log.New(os.Stdout, <span class="hljs-string">&quot;\r\n&quot;</span
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22
associations.html
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@ -861,15 +861,27 @@ db.Model(&amp;language).Related(&amp;users)
}
</code></pre>
<h3 id="self-referencing-many-to-many-relationship">Self-Referencing Many To Many Relationship</h3>
<p>To define a self-referencing many2many relationship, you have to change association&apos;s join table foreign key.</p>
<p>to make sure make it different with source&apos;s foreign key, which is generated using struct&apos;s name and its priamry key.</p>
<p>for example:</p>
<p>To define a self-referencing many2many relationship, you have to change association&apos;s foreign key in the join table.</p>
<p>to make it different with source&apos;s foreign key, which is generated using struct&apos;s name and its priamry key, for example:</p>
<pre><code class="lang-go"><span class="hljs-keyword">type</span> User <span class="hljs-keyword">struct</span> {
gorm.Model
Friends []*User <span class="hljs-string">`gorm:&quot;many2many:friendships;association_jointable_foreignkey:friend_id&quot;`</span>
}
</code></pre>
<p>It will create a join table with foreign key <code>user_id</code> and <code>friend_id</code>, and use it to save user&apos;s self-reference relationship.</p>
<p>GORM will create a join table with foreign key <code>user_id</code> and <code>friend_id</code>, and use it to save user&apos;s self-reference relationship.</p>
<p>Then you can operate it like normal relations, e.g:</p>
<pre><code class="lang-go">DB.Preload(<span class="hljs-string">&quot;Friends&quot;</span>).First(&amp;user, <span class="hljs-string">&quot;id = ?&quot;</span>, <span class="hljs-number">1</span>)
DB.Model(&amp;user).Association(<span class="hljs-string">&quot;Friends&quot;</span>).Append(&amp;User{Name: <span class="hljs-string">&quot;friend1&quot;</span>}, &amp;User{Name: <span class="hljs-string">&quot;friend2&quot;</span>})
DB.Model(&amp;user).Association(<span class="hljs-string">&quot;Friends&quot;</span>).Delete(&amp;User{Name: <span class="hljs-string">&quot;friend2&quot;</span>})
DB.Model(&amp;user).Association(<span class="hljs-string">&quot;Friends&quot;</span>).Replace(&amp;User{Name: <span class="hljs-string">&quot;new friend&quot;</span>})
DB.Model(&amp;user).Association(<span class="hljs-string">&quot;Friends&quot;</span>).Clear()
DB.Model(&amp;user).Association(<span class="hljs-string">&quot;Friends&quot;</span>).Count()
</code></pre>
<h2 id="polymorphism">Polymorphism</h2>
<p>Supports polymorphic has-many and has-one associations.</p>
<pre><code class="lang-go"> <span class="hljs-keyword">type</span> Cat <span class="hljs-keyword">struct</span> {
@ -972,7 +984,7 @@ db.Model(&amp;user).Association(<span class="hljs-string">&quot;Languages&quot;<
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callbacks.html
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@ -788,7 +788,7 @@ If you want to use those changes in your callbacks, you need to run your SQL in
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changelog.html
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crud.html
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@ -1353,7 +1353,7 @@ db.Set(<span class="hljs-string">&quot;gorm:association_save_reference&quot;</sp
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database.html
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@ -845,7 +845,7 @@ db.Model(&amp;User{}).RemoveIndex(<span class="hljs-string">&quot;idx_user_name&
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2
development.html
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@ -791,7 +791,7 @@ db.Callback().RowQuery().Register(<span class="hljs-string">&quot;publish:update
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</div>

2
dialects.html
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@ -765,7 +765,7 @@ fmt.Println(<span class="hljs-string">&quot;Inserted fields are as expected:&quo
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</div>

24
documents/associations.md
View File

@ -230,11 +230,9 @@ type CustomizeAccount struct {
### Self-Referencing Many To Many Relationship
To define a self-referencing many2many relationship, you have to change association's join table foreign key.
To define a self-referencing many2many relationship, you have to change association's foreign key in the join table.
to make sure make it different with source's foreign key, which is generated using struct's name and its priamry key.
for example:
to make it different with source's foreign key, which is generated using struct's name and its priamry key, for example:
```go
type User struct {
@ -243,7 +241,23 @@ type User struct {
}
```
It will create a join table with foreign key `user_id` and `friend_id`, and use it to save user's self-reference relationship.
GORM will create a join table with foreign key `user_id` and `friend_id`, and use it to save user's self-reference relationship.
Then you can operate it like normal relations, e.g:
```go
DB.Preload("Friends").First(&user, "id = ?", 1)
DB.Model(&user).Association("Friends").Append(&User{Name: "friend1"}, &User{Name: "friend2"})
DB.Model(&user).Association("Friends").Delete(&User{Name: "friend2"})
DB.Model(&user).Association("Friends").Replace(&User{Name: "new friend"})
DB.Model(&user).Association("Friends").Clear()
DB.Model(&user).Association("Friends").Count()
```
## Polymorphism

2
index.html
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@ -789,7 +789,7 @@
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2
models.html
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@ -857,7 +857,7 @@ db.Model(&amp;user).Update(<span class="hljs-string">&quot;name&quot;</span>, <s
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</div>

2
search_index.json
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