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    <p>Here's how I implemented a HashMap using your models.</p> <pre><code>@Entity public class ImageModel extends Model { //All your fields, etc. @ManyToMany(mappedBy = "imagesWithTag") @MapKey(name = "name") public Map&lt;String,Tag&gt; tags = new HashMap&lt;String,Tag&gt;(); } @Entity public class Tag extends Model { // All your fields, etc. public String name; public String value; @ManyToMany public List&lt;ImageModel&gt; imagesWithTag = new ArrayList&lt;ImageModel&gt;(); } </code></pre> <p>I decided to go with Eric's suggestion of creating an entire model for Tag, as to make queries easily, but there are times where being able to use the functionalities of a Map will help a lot. This should work for EnumMaps too.</p> <pre><code>public void addTag(String tagName, String value) { Tag tag = Tag.finderTag.where().eq("name", tagName).eq("value", value).findUnique(); if(tag == null) { tag = Tag.newTag(tagName, value); } this.tags.put(tag.name, tag); this.saveManyToManyAssociations("tags"); } public static List&lt;ImageModel&gt; getImagesWithTag(String tagName, String tagValue) { Tag tag = finderTag.where().eq("name", tagName).eq("value", tagValue).findUnique(); List&lt;ImageModel&gt; images = new ArrayList&lt;ImageModel&gt;(); for(ImageModel model : tag.imagesWithTag) { images.add(model); } return images; } </code></pre> <p>I have seen barely anything about using Maps in Play Framework models, so I decided to create a small sample project (Play 2.1.1) to toy around with and further demonstrate map use. </p> <p><a href="https://github.com/Raymond26/play-framework-demos/tree/master/PlayMap" rel="nofollow">https://github.com/Raymond26/play-framework-demos/tree/master/PlayMap</a></p>
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    1. COThank you for your response and for your whole example from github. I am sincerely grateful.
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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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