谷物嵌套g：每个

Question

I am trying to loop through a list of fields in my index view. Lets say I pass the following to index.gsp:

[SomeDomainList: SomeDomain.list(), fields: ['field1', 'field2', 'field3']]

And then in index.gsp I have:

<g:each in="SomeDomainList" var="SomeDomainInstance">
    <g:each in="fields" var="field">
        <td>${SomeDomainInstance.field}</td>
    </g:each>
</g:each>

I would think that since the SomeDomainInstance variable gets evaluated that the field variable would get evaluated also. However, I get a "No such property: field for class: SomeDomain". I also tried:

<td>${SomeDomainInstance.${field}}</td>

But that results in a "Unclosed GSP expression" error. Can anyone tell me how I can achieve this?

Answer 1

Try adding double quotes to your example:

<td>${SomeDomainInstance."${field}"}</td>

You can just select the fields you're interested in using a criteria query and projections:

def domainList = SomeDomain.createCriteria().list {
    projections {
        property('field1')
        property('field2')
        property('field3')
    }
}

[SomeDomainList: domainList]

Or if you need the column names:

def domainList = SomeDomain.withCriteria{
    resultTransformer(CriteriaSpecification.ALIAS_TO_ENTITY_MAP)
    projections {
        property( 'field1', 'field1')
        property( 'field2', 'field2')
        property( 'field3', 'field3')
    }
}

[SomeDomainList: domainList]

Answer 2

Why people love GStrings so much? A simple subscript operator would do:

<td>${SomeDomainInstance[ field ]}</td>