Databases
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    <p>"Target" combo is empty when you select the first relationship, simply because there's no ObjEntity for the join table. But if you keep selecting the next path component, "Product" will appear in the combobox. I wish we redesign this UI for better clarity, but it still works now. See the DataMap XML sample below. I just created it with 3.0.2 Modeler.</p> <p>Hope this helps.</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;data-map xmlns="http://cayenne.apache.org/schema/3.0/modelMap" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://cayenne.apache.org/schema/3.0/modelMap http://cayenne.apache.org/schema/3.0/modelMap.xsd" project-version="3.0.0.1"&gt; &lt;db-entity name="composition"&gt; &lt;db-attribute name="BASE_ID" type="INTEGER" isPrimaryKey="true" isMandatory="true"/&gt; &lt;db-attribute name="CONTAINED_ID" type="INTEGER" isPrimaryKey="true" isMandatory="true"/&gt; &lt;/db-entity&gt; &lt;db-entity name="product"&gt; &lt;db-attribute name="ID" type="INTEGER" isPrimaryKey="true" isMandatory="true"/&gt; &lt;db-attribute name="NAME" type="VARCHAR" length="255"/&gt; &lt;/db-entity&gt; &lt;obj-entity name="Product" dbEntityName="product"&gt; &lt;obj-attribute name="name" type="java.lang.String" db-attribute-path="NAME"/&gt; &lt;/obj-entity&gt; &lt;db-relationship name="base" source="composition" target="product" toMany="false"&gt; &lt;db-attribute-pair source="BASE_ID" target="ID"/&gt; &lt;/db-relationship&gt; &lt;db-relationship name="contained" source="composition" target="product" toMany="false"&gt; &lt;db-attribute-pair source="CONTAINED_ID" target="ID"/&gt; &lt;/db-relationship&gt; &lt;db-relationship name="base" source="product" target="composition" toDependentPK="true" toMany="true"&gt; &lt;db-attribute-pair source="ID" target="BASE_ID"/&gt; &lt;/db-relationship&gt; &lt;db-relationship name="contained" source="product" target="composition" toDependentPK="true" toMany="true"&gt; &lt;db-attribute-pair source="ID" target="CONTAINED_ID"/&gt; &lt;/db-relationship&gt; &lt;obj-relationship name="base" source="Product" target="Product" deleteRule="Deny" db-relationship-path="contained.base"/&gt; &lt;obj-relationship name="contained" source="Product" target="Product" deleteRule="Deny" db-relationship-path="base.contained"/&gt; &lt;/data-map&gt; </code></pre>
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    1. POApache Cayenne many-to-many relationship
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    1. USandrus_a
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    1. POApache Cayenne many-to-many relationship
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    1. COThank you. It was just a bit .. confusing.. but it works!
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      1. USFrancesco
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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