Tri.form

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* Add `endpoint` namespace to `Form` and `Field` constructor to add custom endpoint callbacks.

* Add `config` and `validate` endpoint implementations

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* Fix formatting of form field error output when there are multiple field errors

* Fix bug in form validation signaling required field missing on choices where the value is falsy, e.g. 0

* Implement djangos uniqueness validation on save in forms/views.py

* Fixed input type on url field

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* Improved handling of `from_model`. You can now do the following without issues:

.. code:: python

form = Form.from_model(field__foo__class=Form.integer)

* The incorrectly named parameter `db_field` to `Form.fields_from_model` has been renamed to the correct `field`.

* The parameter `db_field` to `create_members_from_model` has been renamed to `member_params_by_member_name`.

* Better logic for figuring out which mode we're in when POST-ing

* Allow `None` as `endpoint_dispatch_prefix`.

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* Fixed namespace dispatch bugs in `create_or_edit_object`

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* Compatible with Django 1.9 & 1.10

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* Field.datetime is more forgiving in the formats it receives: it will not accept ISO8601 formats but missing seconds or seconds+minutes

* Field.boolean field didn't respect specified input_template

* Inputs that were parsed to lists where the field was a list now works properly: None is not passed to the validation function.

* Fixed pypi rendering of documentation

* More honest coverage numbers