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POSqueryl: how to compare Option[T] objects in where clause?
 

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  1. POSqueryl: how to compare Option[T] objects in where clause?
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    <p>I got stuck with the following problem.</p> <p>I have a class, say Post, that looks like:</p> <pre><code>case class Post ( id: Int, slug: String, title: String, @Column("postText") text: String, isVisible: Boolean, created: Timestamp, lastUpdated: Timestamp, published: Option[Timestamp] ) extends KeyedEntity[Int] </code></pre> <p>My problem is to get previous and next posts from the database, when the posts in ordered by <em>published</em> field. The problem I stuck with is that published field is Option[Timestamp]. I created a Squeryl query like this:</p> <pre><code>val nextPost = from(postTable)( p =&gt; where((p.published &gt; post.published) and p.isVisible === true) select(p) orderBy(p.published asc) ).page(0, 1) </code></pre> <p>And when I looked at the resulted sql I saw something like this: <em>"... WHERE post.published > Some("....") ..."</em> and of course this resulted in a syntax error in SQL query.</p> <p>I looked throgh the documentation, but cannot find the answer. I am already thinking of switching to Slick...</p> <p><strong>UPDATE</strong></p> <p>There is a definite bug in squeryl mysql query construction. I ended up with </p> <pre><code>val x : Timestamp = post.published.getOrElse(new Timestamp(0)) val nextPost = from(postTable)( p =&gt; where((p.published.getOrElse(new Timestamp(0)) &gt; x) and p.isVisible === true) select(p) orderBy(p.published asc) ).page(0, 1) </code></pre> <p>which produces query:</p> <pre><code>Select Post9.lastUpdated as Post9_lastUpdated, Post9.published as Post9_published, Post9.postText as Post9_postText, Post9.slug as Post9_slug, Post9.id as Post9_id, Post9.isVisible as Post9_isVisible, Post9.title as Post9_title, Post9.created as Post9_created From Post Post9 Where ((Post9.published &gt; 2013-08-01 14:21:25.0) and (Post9.isVisible = true)) Order By Post9.published Asc limit 1 offset 0 </code></pre> <p>see, how the query constructor formatted the date...</p> <p>I am switching to SLICK.</p>
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    1. USMike G.
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      1. POSqueryl: how to compare Option[T] objects in where clause?
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    1. COWhich version of Squeryl was this?
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      1. USDave Whittaker
    2. COI looked at my sbt config, it was 0.9.5-6
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      1. USMike G.
    3. COI understand if you've moved on and don't have the time, but I'd love to see a reproducible test case so we can get a fix together if this is a bug. You could post it here, or (preferably) on the Squeryl List https://groups.google.com/forum/#!forum/squeryl.
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      1. USDave Whittaker
 

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