OpenTreeMap / otm-core / 2992

2992

Pull #3124

travis-ci

web-flow 
upgrade HStore

Overview
--------

The point of this commit is to switch from
`django_hstore.fields.DictionaryField` to
`django.contrib.postgres.fields.HStoreField`.

The former is incompatible with later releases of django,
and OpenTreeMap needs to migrate from the current 1.8 to 1.11
for stability.

The latter is the sanctioned django interface to PostgreSQL's hstore
going forward.

The latter is also less functional than the former, prompting a series
of other changes.
Changes were also made for the sake of maintenance simplicity.

The key changes here are in `treemap.udf`, `treemap.audit`, `*.models`, and
`treemap.search`.

**treemap.udf**

Entry points:
-   `UDFModel`, a base class for models that need user defined fields
-   `UserDefinedFieldDefinition`, defines the name, data type, and model type
    for a user defined field, for a given treemap instance, as a
    scalar or a collection
-   `UserDefinedCollectionValue`, an HStore collection value for a
    specific `UserDefinedFieldDefinition` on a specific model instance

`UDFModel` user guide:

Classes that want custom fields subclass `UDFModel`.

To assign a custom field,
    `my_model_instance.udfs['custom field name'] = value`

There are three ways to retrieve it:
    `my_model_instance.udfs['custom field name']`
    `getattr(my_model_instance, 'custom field name')`
    `getattr(my_model_instance, 'udf:custom field name'`)

All of the above work for both scalar and collection custom fields.

Filter `UDFModel` subclass querysets using the `udf` transform.

In addition to the transforms and lookups described at
https://docs.djangoproject.com/en/1.8/ref/contrib/postgres/fields/,
`UDFModel` implements `__int` and `__float` transforms, for use
before magnitude comparisons (`__gt`, `__gte`, `__lt`, `__lte`).
Without them, comparison is lexical, which does not yield the
same results as a numerical comparison.

For example, to filter a queryset for a custom field value
corresponding to an integer ... (continued)
Pull Request #3124: update HStore

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opentreemap/treemap/management/commands/random_trees.py


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