Ember Data, tree-like data, and parent links

@steveklabnik wrote:

Hey all!

I have a model named Module. It looks like this:

import DS from 'ember-data';

export default DS.Model.extend({
    name: DS.attr(),
    modules: DS.hasMany('modules', { inverse: null}),
});

Modules form a tree: there’s a “crate” model at the root, and it can contain zero or more modules, and then each module can contain zero or more child modules. It’s always a tree, not a general graph.

This is working great. My modules can see their children, everything works.

However, I want a link to the parent module from the child.

I have JSON that looks like this. As you can see, there’s also a “crate” module that has modules, this is the root of the tree.

{
    "data": {
      "type": "crate",
      "id": "example",
      "relationships": {
        "modules": {
          "data": [
            {
              "type": "module",
              "id": "example::nested1"
            }
          ]
        }
      }
    },
    "included": [
      {
        "type": "module",
        "id": "example::nested1",
        "attributes": {
          "name": "nested1",
          "docs": " nested 1\n"
        },
        "relationships": {
          "modules": {
            "data": [
              {
                "type": "module",
                "id": "example::nested1::nested2"
              }
            ]
          }
        }
      },
      {
        "type": "module",
        "id": "example::nested1::nested2",
        "attributes": {
          "name": "nested2",
          "docs": " nested 2\n"
        },
        "relationships": {
          "modules": {
            "data": [
              {
                "type": "module",
                "id": "example::nested1::nested2::nested3"
              }
            ]
          }
        }
      },
      {
        "type": "module",
        "id": "example::nested1::nested2::nested3",
        "attributes": {
          "name": "nested3",
          "docs": " nested 3\n"
        }
      }
    ]
  }

I cut out relevant context from the actual json, so hopefully I didn’t screw it up. As I said, this should be working for traversing down the tree.

and I tried adding something like this to my model, but it doesn’t work. No surprise as I’m pretty much just flailing here:

import DS from 'ember-data';

export default DS.Model.extend({
    name: DS.attr(),
    modules: DS.hasMany('modules', { inverse: null}),
    parent_module: DS.belongsTo('module', { inverse: 'modules'}),
});

Any way I can do this? I’ve also though, if ember-data can’t handle it, my route could try to look stuff up, since any module belongs to one parent?

Thanks!

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