zry
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gorm


			
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        <li class="chapter " data-level="1.1" data-path="./">
            
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                        <b>1.1.</b>
                    
                    Getting Started with GORM
            
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                    Migration
            
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                        <b>1.3.1.</b>
                    
                    Model Definition
            
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                        <b>1.3.2.</b>
                    
                    Conventions & Overriding
            
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                        <b>1.3.3.</b>
                    
                    Associations
            
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                    Belongs To
            
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                    Has One
            
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                    Has Many
            
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                    Many To Many
            
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                    Polymorphism
            
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                        <b>1.3.3.6.</b>
                    
                    Association Mode
            
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                    Dialect Specific Data Type
            
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                        <b>1.4.</b>
                    
                    CRUD: Reading and Writing Data
            
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                        <b>1.4.1.</b>
                    
                    Create
            
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                    Query
            
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                    Preloading (Eager Loading)
            
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                    Update
            
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                        <b>1.4.5.</b>
                    
                    Delete / Soft Delete
            
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                    Associations
            
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                        <b>1.5.</b>
                    
                    Callbacks
            
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                        <b>1.6.</b>
                    
                    Advanced Usage
            
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                    Error Handling
            
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                    Transactions
            
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                    Raw SQL & SQL Builder
            
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                        <b>1.6.4.</b>
                    
                    Generic database interface sql.DB
            
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                        <b>1.6.5.</b>
                    
                    Composite Primary Key
            
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                    Overriding Logger
            
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                    Write Plugins
            
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                                <h1 id="change-log">Change Log</h1>
<h2 id="v10">v1.0</h2>
<h4 id="breaking-changes">Breaking Changes</h4>
<ul>
<li><p><strong><code>gorm.Open</code> return type <code>*gorm.DB</code> instead of <code>gorm.DB</code></strong></p>
</li>
<li><p><strong>Updating will only update changed fields</strong></p>
<p>Most applications won&apos;t be affected, only when you are changing updating values in callbacks like <code>BeforeSave</code>, <code>BeforeUpdate</code>, you should use <code>scope.SetColumn</code> then, for example:</p>
<pre><code class="lang-go"><span class="hljs-keyword">func</span> (user *User) BeforeUpdate(scope *gorm.Scope) {
  <span class="hljs-keyword">if</span> pw, err := bcrypt.GenerateFromPassword(user.Password, <span class="hljs-number">0</span>); err == <span class="hljs-literal">nil</span> {
    scope.SetColumn(<span class="hljs-string">&quot;EncryptedPassword&quot;</span>, pw)
    <span class="hljs-comment">// user.EncryptedPassword = pw  // doesn&apos;t work, won&apos;t including EncryptedPassword field when updating</span>
  }
}
</code></pre>
</li>
<li><p><strong>Soft Delete&apos;s default querying scope will only check <code>deleted_at IS NULL</code></strong></p>
<p>Before it will check <code>deleted_at</code> less than <code>0001-01-02</code> also to exclude blank time, like:</p>
<p><code>SELECT * FROM users WHERE deleted_at IS NULL OR deleted_at &lt;= &apos;0001-01-02&apos;</code></p>
<p>But it is not necessary if you are using type <code>*time.Time</code> for your model&apos;s <code>DeletedAt</code>, which has been used by <code>gorm.Model</code>, so below SQl is enough</p>
<p><code>SELECT * FROM users WHERE deleted_at IS NULL</code></p>
<p>So if you are using <code>gorm.Model</code>, then you are good, nothing need to be change, just make sure all records having blank time for <code>deleted_at</code> set to <code>NULL</code>, sample migrate script:</p>
</li>
</ul>
<pre><code class="lang-go"><span class="hljs-keyword">import</span> (
    <span class="hljs-string">&quot;github.com/jinzhu/now&quot;</span>
)

<span class="hljs-keyword">func</span> main() {
  <span class="hljs-keyword">var</span> models = []<span class="hljs-keyword">interface</span>{}{&amp;User{}, &amp;Image{}}
  <span class="hljs-keyword">for</span> _, model := <span class="hljs-keyword">range</span> models {
    db.Unscoped().Model(model).Where(<span class="hljs-string">&quot;deleted_at &lt; ?&quot;</span>, now.MustParse(<span class="hljs-string">&quot;0001-01-02&quot;</span>)).Update(<span class="hljs-string">&quot;deleted_at&quot;</span>, gorm.Expr(<span class="hljs-string">&quot;NULL&quot;</span>))
  }
}
</code></pre>
<ul>
<li><p><strong>New ToDBName logic</strong></p>
<p>Before when GORM convert Struct, Field&apos;s name to db name, only those common initialisms from <a href="https://github.com/golang/lint/blob/master/lint.go#L702" target="_blank">golint</a> like <code>HTTP</code>, <code>URI</code> are special handled.</p>
<p>So field <code>HTTP</code>&apos;s db name will be <code>http</code> not <code>h_t_t_p</code>, but some other initialisms like <code>SKU</code> that not in golint, it&apos;s db name will be <code>s_k_u</code>, which looks ugly, this release fixed this, any upper case initialisms should be converted correctly.</p>
<p>If your applications using some upper case initialisms which doesn&apos;t exist in <a href="https://github.com/golang/lint/blob/master/lint.go#L702" target="_blank">golint</a>, you need to overwrite default column name with tag, like <code>gorm:&quot;column:s_k_u&quot;</code>, or alert your database&apos;s column name according to new logic</p>
</li>
<li><p>Error <code>RecordNotFound</code> has been renamed to <code>ErrRecordNotFound</code></p>
</li>
<li><p><code>mssql</code> driver has been moved out from default drivers, import it with <code>import _ &quot;github.com/jinzhu/gorm/dialects/mssql&quot;</code></p>
</li>
<li><p><code>Hstore</code> has been moved to package <code>github.com/jinzhu/gorm/dialects/postgres</code></p>
</li>
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