Online Gaming - MongoDB Applied Design Patterns - page 165

<dd> <dd> {{value.head[0].description}} </dd> </dd>

{% endif %}
{% if value.hands %}
<dt>

<dt> Gloves </dt> </dt>

<dd> <dd> {{value.hands[0].description}} </dd> </dd>

{% endif %}
{% if value.feet %}
<dt>

<dt> Boots </dt> </dt>

<dd> <dd> {{value.feet[0].description}} </dd> </dd>

{% endif %}
{% if value.body %}
<dt> <dt> Body Armor </dt> </dt>

<dd><ul> <dd><ul> {% for piece in value.body %}

<li>

<li> piece.description </li> </li>

{% endfor %} </ul></dd> </ul></dd>

{% endif %}
</dl>

</dl>
</dd> </dd>

In this case, we want the various description fields to be text similar to “+3 wizard's hat.”
The context passed to this template, then, would be of the following form:

{

"head" : [ { "id" : ... , "description" : "+3 wizard's hat" } ],
"hands" : [],
"feet" : [ { "id" : ... , "description" : "old boots" } ],
"body" : [ { "id" : ... , "description" : "wizard's robe" } ],

}

In order to build up this structure, we'll use the following helper functions:

def def get_item_index ( inventory ):

'''Given an inventory attribute, recursively build up an item
index (including all items contained within other items)
'''

result = {}
for for item iin inventory :

result [ item [ '_id' ]] = item
iif 'inventory' iin item :
result . update ( get_item_index ( item [ 'inventory]))

return return result