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Indexed Dictionary Class

Project description

indicted
=========

indicted - Indexed Document Class

Summary
-------

Find an list element, which is a dict, by a keys value

Usage
-----

Take for example the following data. This structure is being used to reduce
relationships between a parent object and sub objects. This allows us to create
indexes that help with relationships rather than making multiple calls to a
database. This is just an example structure of a document. This specific
structure will benifit heavily from a multi-value index on **subdata._id**.

```javascript
{
"_id" : ObjectId("4f3eb7cac4f804960a859467"),
"subdata" : [
{
"_id" : ObjectId("4f3eb7cac4f804960a859468"),
"bits" : 1234
},
{
"_id" : ObjectId("4f3eb7cac4f804960a859469"),
"bits" : 5678
}
]
}
```

If we access the **subdata** key in the root of this document we will be given
an array when using standard Dict/List types.

```python
[{u'_id': ObjectId('4f3eb7cac4f804960a859468'), u'bits': 1234.0},
{u'_id': ObjectId('4f3eb7cac4f804960a859469'), u'bits': 5678.0}]
```

Ideally we would want to return the list element that matches a specific **_id**
if the list contains dictionaries that have a key matching that ObjectId. This
is where indicted and Inist comes in. InDict is a simple Dict wrapper
that uses InList for all list type values. As InList is initialized and
modified it keeps an internal dictionary of **_id** references relating to list
positions. An extra function called **InList.find** is used to pull out a
referenced object if it finds one. **None** is returned otherwise.

```python
import pprint
import pymongo

from bson import ObjectId

from indicted import InDict

class MongoInDict(InDict):
INDEXCLASS = ObjectId
INDEXKEY = '_id'

connection = pymongo.Connection(document_class=MongoInDict)
database = connection.test

data = database.data.find_one()

pprint.pprint(data['subdata'].find(ObjectId('4f3eb7cac4f804960a859469')))
pprint.pprint(data['subdata'].find(ObjectId('000000000000000000000000')))
```

Yields

```python
{u'_id': ObjectId('4f3eb7cac4f804960a859469'), u'bits': 5678.0}
None
```

There is also **indicted.OrderedInDict** that inherits
**collections.OrderedDict**. This is incredibly useful for maintaining the
document key ordering of your documents.

Status
------

Currently this module only creates references during the initialization of the
list. This will be addressed soon.

Todo
----

* Dot notation
* JSON encoding/decoding/pretty printing helpers

Project details


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