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POForeign key is null when saving
 

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  1. POForeign key is null when saving
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    <p>When trying to save the parent with a many-to-one relationship in the database the child is not updated with the correct father's ID.</p> <p>I have found this questions here that are similar, although they did not work for me:</p> <p><a href="https://stackoverflow.com/questions/4207758/nhibernate-one-to-many-foreign-key-is-null">NHibernate one-to-many foreign key is NULL</a></p> <p><a href="https://stackoverflow.com/questions/8152707/nhibernate-many-to-one-parent-is-always-null-on-insert">nhibernate many-to-one parent is always null on insert</a></p> <p>This is my "father" mapping followed by its class:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;hibernate-mapping assembly="FrancosPoS" namespace="FrancosPoS.DBMapping" xmlns="urn:nhibernate-mapping-2.2"&gt; &lt;class name="order" table="`order`" lazy="true" &gt; &lt;id name="idOrder"&gt; &lt;generator class="identity" /&gt; &lt;/id&gt; &lt;property name="price"&gt; &lt;column name="price" sql-type="decimal(8,4)" not-null="true" /&gt; &lt;/property&gt; &lt;property name="cash"&gt; &lt;column name="cash" sql-type="tinyint(1)" not-null="false" /&gt; &lt;/property&gt; &lt;property name="credit"&gt; &lt;column name="credit" sql-type="tinyint(1)" not-null="false" /&gt; &lt;/property&gt; &lt;property name="obs"&gt; &lt;column name="obs" sql-type="varchar(350)" not-null="false" /&gt; &lt;/property&gt; &lt;bag name="orderPsi" table="ordPsi" cascade="all" inverse="true"&gt; &lt;key column="idOrdPastaI"/&gt; &lt;one-to-many class="ordPsi"/&gt; &lt;/bag&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>Class:</p> <pre><code>namespace FrancosPoS.DBMapping { public partial class order { public order() { } public virtual int idOrder { get; set; } public virtual string price { get; set; } public virtual System.Nullable&lt;int&gt; cash { get; set; } public virtual System.Nullable&lt;int&gt; credit { get; set; } public virtual string obs { get; set; } public virtual IList&lt;ordPsi&gt; orderPsi { get; set; } } } </code></pre> <p>Then, I can have as many orderPsi referring to the same order:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;hibernate-mapping assembly="FrancosPoS" namespace="FrancosPoS.DBMapping" xmlns="urn:nhibernate-mapping-2.2"&gt; &lt;class name="ordPsi" table="ord_psi" lazy="true" &gt; &lt;id name="idOrdPastaI"&gt; &lt;generator class="identity" /&gt; &lt;/id&gt; &lt;many-to-one insert="false" update="false" lazy="false" name="order" class="order"&gt; &lt;column name="idOrder" sql-type="int(11)" not-null="false" /&gt; &lt;/many-to-one&gt; &lt;property name="obs"&gt; &lt;column name="obs" sql-type="varchar(50)" not-null="false" /&gt; &lt;/property&gt; &lt;property name="price"&gt; &lt;column name="price" sql-type="decimal(8,4)" not-null="true" /&gt; &lt;/property&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>Class:</p> <pre><code>public partial class ordPsi { public ordPsi() { } public virtual int idOrdPastaI { get; set; } public virtual order order { get; set; } public virtual string obs { get; set; } public virtual string price { get; set; } } </code></pre> <p>Finally, for saving it:</p> <pre><code>order order = new order(); ordPsi orderPsi = new ordPsi(); order.price = "321"; order.cash = 1; order.credit = 0; orderPsi.order = order; orderPsi.price = "20.00"; order.orderPsi = new List&lt;ordPsi&gt;(); order.orderPsi.Add(orderPsi); //add the child to the father orderDB.setOrder(order); </code></pre> <p>with the database method:</p> <pre><code>public string setOrder(order order) { try { databaseConnection conn = new databaseConnection(); conn.OpenConnection(); conn.Session.SaveOrUpdate(order); conn.Commit(); conn.CloseConnection(); return "Success"; } catch (Exception err) { return "Error: " + err; } } </code></pre> <p>Everything compiles fine and saves to the database because I do not have null constraints, but the ordPsi table is not updated with the orderID.</p> <p>I also tried to save the two objects before committing; leaving the inverse="false" without setting the "orderPsi.order = order", but no success.</p> <p>If this help, I am in most following this two tutorials:</p> <p><a href="http://www.emadashi.com/index.php/2008/08/nhibernate-inverse-attribute/" rel="nofollow noreferrer">NHibernate-inverse-atribute</a></p> <p><a href="http://ajlopez.wordpress.com/2011/05/28/nhibernate-3-part-7-one-to-many-with-inverse/" rel="nofollow noreferrer">one-to-many with inverse</a></p>
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    1. COThe common naming convention in .NET is to name classes with a capital letters, i.e. `class Order`.
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      1. USabatishchev
    2. COThank you for the comment, but in this project is used a different standard than the formal naming convention.
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      1. USgbc921
 

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