Oh Monks,

I again need your enlightened opinions. I am looking at using one of the n-ary tree modules (i.e. Tree, Tree::Simple, Forest ...) to model the relationship between two entities (Locations and Equipment) so that I can generate a generalized view to display the nested hierarchy as well as query parents, siblings and children.

Both entities are defined in a relational database.

The location records contain a parent location field.

The equipment records contain location and parent equipment fields, of which only one can be populated.

Some rules:

• Location may be a child of a Location
• Location has attributes
• Equipment must be a child of a Location XOR an Equipment
• Equipment has attributes

An example in reference syntax

LocationA = {
    Equipment1 => {},
    LocationB  => {
        Equipment2 => {},
        Equipment3 => {
            Equipment4 => {},
            Equipment5 => {},
        },
    },
    LocationC  => {
        LocationD => {
            Equipment6 => {},
            Equipment7 => {
                Equipment8 => {},
                Equipment9 => {},
            },
        },
    },
}
[download]

My questions are:

1. Given the above scenario, do you have a recommendation on which module to use? On what do you base this recommendation - experience, history, support ...
2. Please provide links to any examples or projects of which you are aware from which I can learn.

Thank you in advance,

lbe

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