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POMapping exception when using discriminator in Grails 2.0.0
 

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  1. POMapping exception when using discriminator in Grails 2.0.0
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    <p>At general I have problem with mapping: <code>org.hibernate.MappingException: Repeated column in mapping for entity: os.comida.StoreDocumentRw column: Type (should be mapped with insert="false" update="false")</code></p> <p>To introduce the problem: I have many document types where each document type differs just a little bit from any other. All of them have common properties: date, number, issuer etc. So I decided store all document types in one physical table (one - it's very important for me). To implement this I wanted use hibernate discriminator.</p> <p>Below I'm pasting my source code. I have there a base class <code>StoreDocument</code> and two document types <code>StoreDocumentRw</code> and <code>StoreDocumentWz</code>.</p> <pre><code>class StoreDocument { String type Date documentDate static mapping = { table '"StoreDocument"' version false id column:'"StoreDocumentID"', generator:'sequence', params:[sequence:'STORE_DOCUMENT_SEQ'] discriminator column: '"Type"' documentDate column:'"DocumentDate"' type column:'"Type"' } } class StoreDocumentRw extends StoreDocument { String rwSpecificData static mapping = { discriminator value: 'rw' rwSpecificData column:'"RwSpecificData"' } } class StoreDocumentWz extends StoreDocument { String wzSpecificData static mapping = { discriminator value: 'wz' wzSpecificData column:'"WzSpecificData"' } } </code></pre> <p>And when I'm trying run an app I get mentioned earlier <code>org.hibernate.MappingException: Repeated column in mapping for entity: os.comida.StoreDocumentRw column: Type (should be mapped with insert="false" update="false")</code></p> <p>When I add <code>type insertable: false, updateable: false</code> to <code>StoreDocumentRw</code> mapping, it's still the same. </p> <p>When I add <code>type insertable: false, updateable: false</code> to <code>StoreDocument</code> mapping, it's even worse:</p> <pre><code>ERROR hbm2ddl.SchemaExport - Unsuccessful: create table COMIDA2."StoreDocument" ("StoreDocumentID" number(19,0) not null, "DocumentDate" timestamp not null, "Type" varchar2(255 char), "Type" varchar2(-1 char) not null, "WzSpecificData" varchar2(255 char), "RwSpecificData" varchar2(255 char), primary key ("StoreDocumentID")) ERROR hbm2ddl.SchemaExport - ORA-00957: duplicate column name </code></pre> <p>So I don't know where I should put this insertable/updateable thing to make it working. I'm using Grails 2.0.0 and Oracle 10g. Can anybody tell me what's wrong with my code?</p> <hr> <h2>Solution:</h2> <p>My mapping in <code>StoreDocument</code> was wrong. It's enough to cut <code>String type</code> and <code>type column:'"Type"'</code> and edit discriminator mapping like this <code>discriminator column:[name:'"Type"',length:50]</code>, which in result gives:</p> <pre><code>class StoreDocument { Date documentDate static mapping = { table '"StoreDocument"' version false id column:'"StoreDocumentID"', generator:'sequence', params:[sequence:'STORE_DOCUMENT_SEQ'] discriminator column:[name:'"Type"',length:50] documentDate column:'"DocumentDate"' } } </code></pre>
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