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docs: EXPOSED-626 fix nullTransform example code #2292

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Nov 4, 2024
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docs: EXPOSED-626 fix nullTransform example code #2292

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7fc0729
nullTransform example code fix
kdhyo Nov 1, 2024
a59285c
Revert "nullTransform example code fix"
kdhyo Nov 1, 2024
31d1cd0
fix nullTransform example code
kdhyo Nov 1, 2024
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13 changes: 7 additions & 6 deletions docs/data-types.html
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Expand Up @@ -538,22 +538,23 @@
val mealTime: Column<Meal> = time("meal_time").transform(MealTimeTransformer())
}
</div><section class="chapter"><h3 id="null-transform" data-toc="null-transform">Null transform</h3><p id="-yo0vxf_313">Special case is <code class="code" id="-yo0vxf_314">nullTransform()</code> method. That method applies a special transformation that allows a non-nullable database column to accept and/or return values as `null` on the client side.</p><p id="-yo0vxf_315">This transformation does not alter the column's definition in the database, which will still be <code class="code" id="-yo0vxf_316">NON NULL</code>. It enables reflecting non-null values from the database as <code class="code" id="-yo0vxf_317">null</code> in Kotlin (e.g., converting an empty string from a non-nullable text column, empty lists, negative IDs, etc., to <code class="code" id="-yo0vxf_318">null</code>).</p><div class="code-block" data-lang="kotlin">
class MealTimeNullTransformer : ColumnTransformer&lt;LocalTime, Meal?&gt; {
override fun wrap(value: LocalTime): Meal? = when {
class MealTimeNullTransformer : ColumnTransformer&lt;LocalTime?, Meal?&gt; {
override fun wrap(value: LocalTime?): Meal? = when {
value == null -&gt; null
value.hour &lt; 10 -&gt; Meal.BREAKFAST
value.hour &lt; 15 -&gt; Meal.LUNCH
else -&gt; Meal.DINNER
}

override fun unwrap(value: Meal?): LocalTime = when (value) {
override fun unwrap(value: Meal?): LocalTime? = when (value) {
Meal.BREAKFAST -&gt; LocalTime(8, 0)
Meal.LUNCH -&gt; LocalTime(12, 0)
Meal.DINNER -&gt; LocalTime(18, 0)
else -&gt; LocalTime(0, 0)
else -&gt; null
}
}

object Meals : Table() {
val mealTime: Column&lt;Meal?&gt; = time(&quot;meal_time&quot;).transform(MealTimeNullTransformer())
val mealTime: Column&lt;Meal?&gt; = time(&quot;meal_time&quot;).nullable().transform(MealTimeNullTransformer())
}
</div></section></section><div class="last-modified">Last modified: 30 October 2024</div><div data-feedback-placeholder="true"></div><div class="navigation-links _bottom"><a href="working-with-tables.html" class="navigation-links__prev">Working with tables</a><a href="sql-functions.html" class="navigation-links__next">SQL Functions</a></div></article><div id="disqus_thread"></div></div></section></main></div><script src="https://resources.jetbrains.com/writerside/apidoc/6.10.0-b267/app.js"></script></body></html>
</div></section></section><div class="last-modified">Last modified: 30 October 2024</div><div data-feedback-placeholder="true"></div><div class="navigation-links _bottom"><a href="working-with-tables.html" class="navigation-links__prev">Working with tables</a><a href="sql-functions.html" class="navigation-links__next">SQL Functions</a></div></article><div id="disqus_thread"></div></div></section></main></div><script src="https://resources.jetbrains.com/writerside/apidoc/6.10.0-b267/app.js"></script></body></html>