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POHow to access properties of a related entity in a DQL query (Doctrine 2)?
 

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  1. POHow to access properties of a related entity in a DQL query (Doctrine 2)?
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    <p>I have set up a many to one relationship between a schools entity and students entity, I've linked the two together using a manyToOne relationship;</p> <p><strong>Students entity:</strong></p> <pre><code>/** * @var \Doctrine\Common\Collections\Collection * @ManyToOne(targetEntity="Schools", inversedBy="Students") * @JoinColumn(name="school_id", referencedColumnName="school_id") */ private $Schools; </code></pre> <p><strong>Schools entity:</strong></p> <pre><code>/** * @var \Doctrine\Common\Collections\Collection * @OneToMany(targetEntity="Students", mappedBy="Schools") */ private $Students; </code></pre> <p>This works as expected.</p> <p>I am trying to write a query for the Students table which specifies the school_id but I don't know how to specify this within the query;</p> <pre><code>$qb-&gt;select('t.position') -&gt;from('\Entities\Students', 't') -&gt;where($qb-&gt;expr()-&gt;eq('t.studentId', ':student_id')) -&gt;andWhere($qb-&gt;expr()-&gt;eq('t.Schools.schoolId', ':school_id')) // doesn't work -&gt;setParameters(array('student_id' =&gt; $this-&gt;studentId, 'school_id' =&gt; $school_id)); </code></pre> <p>I've attempted to access the school id through $Schools property I set up in the student identity but this throws an error.</p> <p>As a temporary fix I've created a $schoolId property in the Students entity and am using this instead but surely this is not the correct way to do this.</p> <p>Appreciate the help.</p> <p><strong>UPDATE</strong></p> <p>I got it to work by changing the line;</p> <pre><code>-&gt;andWhere($qb-&gt;expr()-&gt;eq('t.Schools.schoolId', ':school_id')) // doesn't work </code></pre> <p>To:</p> <pre><code>-&gt;andWhere($qb-&gt;expr()-&gt;eq('t.Schools', ':school_id')) </code></pre> <p>However the same approach doesn't work with the following query:</p> <pre><code>$qb-&gt;select('DISTINCT t.age, s.Schools') // Doesn't work -&gt;from('\Entities\Schools', 't') -&gt;innerJoin('t.Students', 's') </code></pre> <p>The following error is displayed:</p> <pre><code>[Semantical Error] line 0, col 28 near 'Schools FROM': Error: Invalid PathExpression. Must be a StateFieldPathExpression. </code></pre>
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    1. COYou have `school_id` in entity declaration and `schoolId` in the query. Check that your `School` class have $schoolId parameter, not `$school_id`. Also, you have `student_id` parameter, but you set `group_id`. Are you sure about that?
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      1. POHow to access properties of a related entity in a DQL query (Doctrine 2)?
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    2. COThe differences between school_id and schoolId are just my parameter naming convention, apologies if this is confusing. The group_id was a typo whilst writing the question on here and does not exist in the original code hence I've corrected here.
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      1. POHow to access properties of a related entity in a DQL query (Doctrine 2)?
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    3. COI don't think it is naming convention :). Do you have `schoolId` property in `School` class with `@Column` on it? It is essential, as in your query you are using it: `'t.Schools.schoolId`, but your `Students` entry makes it clear, that your DB field is named `school_id`
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      1. POHow to access properties of a related entity in a DQL query (Doctrine 2)?
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