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FormAlchemy greatly speeds development with SQLAlchemy mapped classes (models) in a HTML forms environment.

Project description


FormAlchemy eliminates boilerplate by autogenerating HTML input fields from a given model. FormAlchemy will try to figure out what kind of HTML code should be returned by introspecting the model’s properties and generate ready-to-use HTML code that will fit the developer’s application.

Of course, FormAlchemy can’t figure out everything, i.e, the developer might want to display only a few columns from the given model. Thus, FormAlchemy is also highly customizable.

Please visit the FormAlchemy’s homepage for documentation and more information:

You can subscribe to FormAlchemy’s mailing list:


1.5.6 (2020-11-12)

  • Release with completed changelog and updated links.


  • Fix a wrong import of six in


  • No changes were recorded.


  • Allow overriding renderer_opts via an “attrs=…” column option


  • Pull in the 1.4.5-dev changes. Sorry about that.


  • minor code reorg


  • The big one: be compatible with Python 3.x.

    • actually, Python 3.3+, because of u’’ string literals

    • drop Pylons support because that won’t be ported to Py3

    • skip HTML5 tests until Selenium works with Py3


  • Add FieldSet.reconfigure (like configure, but doesn’t toss your previous changes)

  • Don’t test whether the session you pass in is a member of well-known session class. It may be a proxy object.


  • SQLAlchemy 0.9+ support

  • dropped sqlalchemy 0.4 compatibility

  • Enable passing ‘attrs’ to field options

  • Interoperability with Werkzeug

  • Grid interface: iterate columns directly

  • XSS protection: always HTML-escape field contents

  • added an iterator to Grid


  • Allow fields to set their readonly status to False as well as True.

  • SQLAlchemy 0.8+ support

  • Broke the test system and added questionable fixes (IMHO – smurfix)


  • WebOb1.2 compat

  • Add some HTML5 renderer

  • Improve fsblob deletion. issue 16

  • Add support for fanstatic in pytlons (thanks to Bruno Binet aka inneos)


  • Implemented WebOb-like request passing to FieldSet directly.

  • Also implemented request passing to Grid

  • Added support to set .html_options with Field.set(html={‘some’: ‘thing’})

  • Added support for set(validators=[validator1, validator2]) which adds the specified validators.

  • Fixed the set(null_as=…), was nul_as and badly wired in.

  • Improved documentation for the Field.set() method

  • Support zope.schema.Password

  • Fix issues 9, 10, 11, 12


  • Fix issue 5, 7

  • Allow to binf form to a webob like request

  • Add Column wrapper to store some form options in models

  • Field label translation


  • fix unicode issue with non webob based framework


  • use webob.multidict as data. This will improve unicode handling in the future (eg: py3k migration). WebOb is now a dependency.

  • add to_dict() method and .bind(with_prefix=True/False) to help to work with json data

  • improve ext.fsblob. files are wrote on the file system using shutil.copyfileobj from the cgi.FieldStorage field

  • Add a HiddenFieldRendererFactory and allow to hide Date/Time fields via .hidden() and .set(hidden=True) (Thanks to tarek to put this idea in my brain)

  • added german translation (thanks @disko for pull request)

  • fix issue 1, 2 (on github)


  • fix issues 150, 151, 153, 161, 162

  • Added field.label() and field.label_tags()

  • Major refactoring. The base module no longer existe.


  • No longer use Binary type. Use LargeBinary instead.

  • fix issues 145, 147


  • renderer._value is deprecated. Use renderer.value

  • added renderer.raw_value

  • Model.__html__() (if any) is used to render model in read_only mode.


  • Added .insert_after(field, new_field) to the FieldSet object. Same as .insert(), except it adds it after the specified field.

  • Docs improvements

  • Fix 131 to 137


  • Added .value_objects to both Field and FieldRenderer objects. Returns the objects instead of list of primary keys when working with ForeignKeys.

  • add IntervalFieldRenderer

  • switch back to WebHelpers

  • add Hungarian translation (125)

  • fix bug with latest version of couchdbkit

  • update paster template to Pylons 1.0b1

  • fix issues 123, 124, 127, 128


  • include css in


  • new controllers to generate CRUD interfaces based on pylons RESTController

  • couchdb support improvement (allow to use RESTController)

  • Experimental RDFAlchemy support

  • Add date formats to config module.

  • add fs.copy()

  • zope.schema.List and zope.schema.Choice support (thanks to Christophe Combelles)

  • fix issues 107, 113, 114, 117, 118

  • css improvement for pylons admin interface


  • Added fs.append(field) fs.insert(field, new_field) and del fs.field to Fieldset. fs.add() is deprecated.

  • Added field.set() to modify the field inplace.

  • bug fixes: issues 70, 80, 82, 97

  • added spanish tanslation (thanks to robarago)

  • added the .with_html method to AbstractField which will be passed to the renderers, allowing to add some HTML attributes to rendered HTML tags. Removed html_options from render method. (See issue #60)

  • validators are now passed as second argument the field being validated. WARN: this will mean adding the parameter to your functions to be backwards compatible. The validator function signature changed from myfunc(value) to myfunc(value, field=None).

  • ext.couchdb now use couchdbkit instead of py-simplecouchdb

  • added the .with_metadata method to AbstractField which allows you to add metadata to your field. The difference with .with_html() is that the attributes passed in will not be rendered in the HTML element, but are there only to be used in your templates, to tweak the output according to those properties. See docs/forms.txt


  • add a paster template to bootstrap a pylons project with FA support enabled

  • much sexier look for admin interface

  • performance improvements

  • non-SQLA Fields are no longer considered “experimental”

  • with_null_as feature (see issue #52)

  • prefix feature (see issue #59)

  • when auto-querying for option values, the order_by given on the relation is used, if any

  • synonym awareness (you don’t have to manually exclude the shadowed attribute)

  • ext.couchdb (experimental)


  • bug fixes: issues 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 49

  • added EscapingReadonlyRenderer

  • add Date*Renderer translation



  • Bug fixes


  • i18n support (gael.pasgrimaud)

  • file upload support (gael.pasgrimaud)

  • mapper property alias support (gael.pasgrimaud)

  • add kwargs to FieldSet and Grid render methods, which are passed on to the template. this allows easy custom template use w/o having to subclass. (lbruno)

  • removed query_options. Just pass the query as the argument to the options parameter, and FA will turn it into (description, value) pairs. FA will also accept an iterable of objects as a value to the options parameter.

  • unicode(object) is used as the default option description, not str(object). (Before, unicode was only used if the engine had convert_unicode turned on.) This is more consistent with normal SA behavior.

  • added sanity checks to disallow getting into an inconsistent state. notably, binding to an object that belongs to a session but does NOT have a primary key set is not allowed. workaround: bind to the class, and FA will instantiate it and take it out of the session [until sync()]. Then you can pull that instance out as the .model attribute.

  • sync() will save model to session, if necessary

  • add Field.with_renderer

  • allow manually-added fields to pull their value from the bound model

  • fs.[field] returns the configured version of the field, not the unconfigured. fs.fields renamed to fs._fields. Added Field.reset() to deepcopy the unconfigured version.

  • explicit renderers required for custom types (FieldRenderer.render removed)

  • new documentation (gael.pasgrimaud)

  • bug fixes


  • Synonym support

  • Bug fixes


  • Composite field and custom type support

  • Joined table support

  • Grid (companion to FieldSet) renders and edits multiple instances at once.

  • readonly support for FieldSet (replacing undocumented Table), Grid (replacing TableCollection)

  • FieldSet can render Fields from a non-mapped class (experimental)

  • Saner (backwards-incompatible, but easy port) widget (FieldRenderer) API

  • FieldSet.render_fields is now an OrderedDict like FieldSet.fields. Use render_fields.[iter]values() to get an iterable like the old render_fields.

  • Bug fixes


  • Bug fixes

  • Much better DateTime support

  • Extensible widget API (want to use your favorite date picker instead? No problem.)

  • FieldRenderer is now part of from formalchemy import * for use here

  • Minor changes to template API (details in documentation). Does not affect you unless you already wrote a custom template

  • order fields by declared order as much as possible, instead of alphabetical, when include= is absent

  • Validator suite fleshed out (minlength, maxlength, regex, email, currency)

  • Added doc sections on widget API and validation functions


  • Completely new API, based on Fields instead of column names

  • Support manually added Fields, not just attributes from the SA model

  • Relations (a FK will be rendered with a dropdown of related objects)

  • Validation + sync

  • Template-based rendering for greater customizibility. Tempita is included; Mako is detected and used if present

  • WebHelpers is no longer a dependency; the small parts FA needs have been moved into (This was prompted by WebHelpers 0.6 breaking backwards compatibility in nontrivial ways.)

  • Pervasive docstrings

  • Preliminary SA 0.5 support

  • Regression test suite


  • Added ‘disable’, ‘disable_pk’, ‘disable_fk’ options.

  • Fixed a bug where ‘readonly*’ options only worked for ‘password’ fields.

  • Added ‘date’, ‘time’ and ‘datetime’ options for date/time fields formatting.

  • Added ‘bool_as_radio’ option.

  • Added a hack to force browsers to POST unckecked checkboxes.

  • Fixed a bug where ‘opts’ from the ‘dropdown’ option is no longer rendered as an attribute of the <select> tag.

  • Fixed a compatibility issue with SQLAlchemy 0.4.1. The ‘foreign_key’ Column attribute is now ‘foreign_keys’.

  • Added ‘fieldset’ option.

  • Added ‘include’ option. Patch from Adam Gomaa.

  • Added ‘textarea’ option. Additionnal patch provided by Adam Gomaa for passing native tuple of intergers as size argument value.

  • Added new experimental, little customizable, ‘TableItem’ and ‘TableCollection’. TableItem renders a table from a bound model. TableCollection renders a table from a collection of items that are of the same class than the bound model: TableCollection(bind=client, collection=client_list). The bound model can be a non-instantiated mapped class.

  • Removed NullType type column detection for now, as it seems to be a SA 0.4 only thing. What would a NullType HTML field represent anyway?

  • FieldSet now returns fields embedded in <fieldset> HTML tags.

  • Implemented the ‘legend’ option for FieldSet to provide an optional and customizable <legend> tag. FieldSet uses the bound model’s class name as the legend by default. The legend can be customized by passing a string to the ‘legend’ option: legend=’My legend’. The fieldset can be legend-less by passing legend=False.

  • Big core changes. Splitted the single module into a formalchemy package. More classes, more flexibility. Plus, we’re now using model-level and column-level rendering engines: ‘ModelRenderer’ and ‘FieldRenderer’.

  • ‘ModelRender’ and ‘FieldRender’ allows you to render a whole model (like FieldSet, but without the fieldset/legend tags) or a single column.

  • FieldSet now uses ‘ModelRenderer’.

  • Added new experimental, little customizable, non-form related, ‘TableItem’ and ‘TableCollection’. TableItem renders a table from a bound model. TableCollection renders a table from a collection of items that are of the same class than the bound model: TableCollection(bind=client, collection=client_list). The bound model can be a non-instantiated mapped class.


  • Initial release.

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