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How to map a list of objects for editing and saving
public static void editTargets(@Required @Min(2011) Integer year, @Required String type, @Required Long groupId) {
    RetailRegion region = RetailRegion.findById(groupId);
    notFoundIfNull(region);
    TargetType tType = TargetType.valueOf(type);
    notFoundIfNull(tType);

    List<Target> targets = Target.findByGroupAndTypeAndYear(region, tType, year);

    if (targets != null && !targets.isEmpty()) {
        render(targets, year, tType, region);
    }
    createTargets(year, type, groupId);
}

public static void createTargets(@Required @Min(2011) Integer year, @Required String type, @Required Long groupId) {
    RetailRegion region = RetailRegion.findById(groupId);
    notFoundIfNull(region);
    TargetType tType = TargetType.valueOf(type);
    notFoundIfNull(tType);

    render(region, year, tType);
}

public static void saveTargets(@Required List<Target> targets) {
    notFoundIfNull(targets);

    for (Target target : targets) {
        if (target != null)
            target.save();
    }

    flash.success("Targets have been saved.");
    if (params.get("_save") != null) {
        mgmt();
    }
    mgmt();
}

#{form id:'targetsForm', method:'POST', action:@saveTargets()}
  <section id="targets">
    <table  width="750px" id="targetsTable">
      <thead>
      <tr>
        <th>Code</th>
        <th>January</th>
      </tr>
      </thead>
      <tbody>
        %{int i = 0;}%
        #{list items:targets, as:'target'}
        <tr>
          #{field 'target.id'}
            <input id="${field.id}" type="hidden" name="${field.name}" value="${field.value}" class="${field.errorClass}" />
          #{/field}
          <td class="center">${targets[i].code}</td>
          <td class="center">
          #{field 'target.jan'}
            <input id="${field.id}" type="number" name="${field.name}" value="${field.value}" class="${field.errorClass}" />
          #{/field}
          </td>
          ...

%{ fieldName = "target[${i}].jan" }%
#{field "${fieldName}"}
    ...
#{/field}