import warnings
import re
from flask import (request, redirect, flash, abort, json, Response,
get_flashed_messages)
from jinja2 import contextfunction
from wtforms.fields import HiddenField
from wtforms.validators import ValidationError, Required
from flask.ext.admin.babel import gettext
from flask.ext.admin.base import BaseView, expose
from flask.ext.admin.form import BaseForm, FormOpts, rules
from flask.ext.admin.model import filters, typefmt
from flask.ext.admin.actions import ActionsMixin
from flask.ext.admin.helpers import (get_form_data, validate_form_on_submit,
get_redirect_target, flash_errors)
from flask.ext.admin.tools import rec_getattr
from flask.ext.admin._backwards import ObsoleteAttr
from flask.ext.admin._compat import iteritems, OrderedDict, as_unicode
from .helpers import prettify_name, get_mdict_item_or_list
from .ajax import AjaxModelLoader
from .fields import ListEditableFieldList
# Used to generate filter query string name
filter_char_re = re.compile('[^a-z0-9 ]')
filter_compact_re = re.compile(' +')
class ViewArgs(object):
"""
List view arguments.
"""
def __init__(self, page=None, sort=None, sort_desc=None, search=None, filters=None, extra_args=None):
self.page = page
self.sort = sort
self.sort_desc = bool(sort_desc)
self.search = search
self.filters = filters
if not self.search:
self.search = None
self.extra_args = extra_args or dict()
def clone(self, **kwargs):
if self.filters:
flt = list(self.filters)
else:
flt = None
kwargs.setdefault('page', self.page)
kwargs.setdefault('sort', self.sort)
kwargs.setdefault('sort_desc', self.sort_desc)
kwargs.setdefault('search', self.search)
kwargs.setdefault('filters', flt)
kwargs.setdefault('extra_args', dict(self.extra_args))
return ViewArgs(**kwargs)
[docs]class BaseModelView(BaseView, ActionsMixin):
"""
Base model view.
This view does not make any assumptions on how models are stored or managed, but expects the following:
1. The provided model is an object
2. The model contains properties
3. Each model contains an attribute which uniquely identifies it (i.e. a primary key for a database model)
4. It is possible to retrieve a list of sorted models with pagination applied from a data source
5. You can get one model by its identifier from the data source
Essentially, if you want to support a new data store, all you have to do is:
1. Derive from the `BaseModelView` class
2. Implement various data-related methods (`get_list`, `get_one`, `create_model`, etc)
3. Implement automatic form generation from the model representation (`scaffold_form`)
"""
# Permissions
can_create = True
"""Is model creation allowed"""
can_edit = True
"""Is model editing allowed"""
can_delete = True
"""Is model deletion allowed"""
# Templates
list_template = 'admin/model/list.html'
"""Default list view template"""
edit_template = 'admin/model/edit.html'
"""Default edit template"""
create_template = 'admin/model/create.html'
"""Default create template"""
# Customizations
column_list = ObsoleteAttr('column_list', 'list_columns', None)
"""
Collection of the model field names for the list view.
If set to `None`, will get them from the model.
For example::
class MyModelView(BaseModelView):
column_list = ('name', 'last_name', 'email')
"""
column_exclude_list = ObsoleteAttr('column_exclude_list',
'excluded_list_columns', None)
"""
Collection of excluded list column names.
For example::
class MyModelView(BaseModelView):
column_exclude_list = ('last_name', 'email')
"""
column_formatters = ObsoleteAttr('column_formatters', 'list_formatters', dict())
"""
Dictionary of list view column formatters.
For example, if you want to show price multiplied by
two, you can do something like this::
class MyModelView(BaseModelView):
column_formatters = dict(price=lambda v, c, m, p: m.price*2)
or using Jinja2 `macro` in template::
from flask.ext.admin.model.template import macro
class MyModelView(BaseModelView):
column_formatters = dict(price=macro('render_price'))
# in template
{% macro render_price(model, column) %}
{{ model.price * 2 }}
{% endmacro %}
The Callback function has the prototype::
def formatter(view, context, model, name):
# `view` is current administrative view
# `context` is instance of jinja2.runtime.Context
# `model` is model instance
# `name` is property name
pass
"""
column_type_formatters = ObsoleteAttr('column_type_formatters', 'list_type_formatters', None)
"""
Dictionary of value type formatters to be used in the list view.
By default, two types are formatted:
1. ``None`` will be displayed as an empty string
2. ``bool`` will be displayed as a checkmark if it is ``True``
If you don't like the default behavior and don't want any type formatters
applied, just override this property with an empty dictionary::
class MyModelView(BaseModelView):
column_type_formatters = dict()
If you want to display `NULL` instead of an empty string, you can do
something like this::
from flask.ext.admin.model import typefmt
MY_DEFAULT_FORMATTERS = dict(typefmt.BASE_FORMATTERS)
MY_DEFAULT_FORMATTERS.update({
type(None): typefmt.null_formatter
})
class MyModelView(BaseModelView):
column_type_formatters = MY_DEFAULT_FORMATTERS
Type formatters have lower priority than list column formatters.
The callback function has following prototype::
def type_formatter(view, value):
# `view` is current administrative view
# `value` value to format
pass
"""
column_labels = ObsoleteAttr('column_labels', 'rename_columns', None)
"""
Dictionary where key is column name and value is string to display.
For example::
class MyModelView(BaseModelView):
column_labels = dict(name='Name', last_name='Last Name')
"""
column_descriptions = None
"""
Dictionary where key is column name and
value is description for `list view` column or add/edit form field.
For example::
class MyModelView(BaseModelView):
column_descriptions = dict(
full_name='First and Last name'
)
"""
column_sortable_list = ObsoleteAttr('column_sortable_list',
'sortable_columns',
None)
"""
Collection of the sortable columns for the list view.
If set to `None`, will get them from the model.
For example::
class MyModelView(BaseModelView):
column_sortable_list = ('name', 'last_name')
If you want to explicitly specify field/column to be used while
sorting, you can use a tuple::
class MyModelView(BaseModelView):
column_sortable_list = ('name', ('user', 'user.username'))
When using SQLAlchemy models, model attributes can be used instead
of strings::
class MyModelView(BaseModelView):
column_sortable_list = ('name', ('user', User.username))
"""
column_default_sort = None
"""
Default sort column if no sorting is applied.
Example::
class MyModelView(BaseModelView):
column_default_sort = 'user'
You can use tuple to control ascending descending order. In following example, items
will be sorted in descending order::
class MyModelView(BaseModelView):
column_default_sort = ('user', True)
"""
column_searchable_list = ObsoleteAttr('column_searchable_list',
'searchable_columns',
None)
"""
A collection of the searchable columns. It is assumed that only
text-only fields are searchable, but it is up to the model
implementation to decide.
Example::
class MyModelView(BaseModelView):
column_searchable_list = ('name', 'email')
"""
column_editable_list = None
"""
Collection of the columns which can be edited from the list view.
For example::
class MyModelView(BaseModelView):
column_editable_list = ('name', 'last_name')
"""
column_choices = None
"""
Map choices to columns in list view
Example::
class MyModelView(BaseModelView):
column_choices = {
'my_column': [
('db_value', 'display_value'),
]
}
"""
column_filters = None
"""
Collection of the column filters.
Can contain either field names or instances of :class:`~flask.ext.admin.model.filters.BaseFilter` classes.
Example::
class MyModelView(BaseModelView):
column_filters = ('user', 'email')
"""
named_filter_urls = False
"""
Set to True to use human-readable names for filters in URL parameters.
False by default so as to be robust across translations.
Changing this parameter will break any existing URLs that have filters.
"""
column_display_pk = ObsoleteAttr('column_display_pk',
'list_display_pk',
False)
"""
Controls if the primary key should be displayed in the list view.
"""
form = None
"""
Form class. Override if you want to use custom form for your model.
Will completely disable form scaffolding functionality.
For example::
class MyForm(Form):
name = StringField('Name')
class MyModelView(BaseModelView):
form = MyForm
"""
form_base_class = BaseForm
"""
Base form class. Will be used by form scaffolding function when creating model form.
Useful if you want to have custom contructor or override some fields.
Example::
class MyBaseForm(Form):
def do_something(self):
pass
class MyModelView(BaseModelView):
form_base_class = MyBaseForm
"""
form_args = None
"""
Dictionary of form field arguments. Refer to WTForms documentation for
list of possible options.
Example::
from wtforms.validators import required
class MyModelView(BaseModelView):
form_args = dict(
name=dict(label='First Name', validators=[required()])
)
"""
form_columns = None
"""
Collection of the model field names for the form. If set to `None` will
get them from the model.
Example::
class MyModelView(BaseModelView):
form_columns = ('name', 'email')
"""
form_excluded_columns = ObsoleteAttr('form_excluded_columns',
'excluded_form_columns',
None)
"""
Collection of excluded form field names.
For example::
class MyModelView(BaseModelView):
form_excluded_columns = ('last_name', 'email')
"""
form_overrides = None
"""
Dictionary of form column overrides.
Example::
class MyModelView(BaseModelView):
form_overrides = dict(name=wtf.FileField)
"""
form_widget_args = None
"""
Dictionary of form widget rendering arguments.
Use this to customize how widget is rendered without using custom template.
Example::
class MyModelView(BaseModelView):
form_widget_args = {
'description': {
'rows': 10,
'style': 'color: black'
}
}
Changing the format of a DateTimeField will require changes to both form_widget_args and form_args.
Example::
form_args = dict(
start=dict(format='%Y-%m-%d %I:%M %p') # changes how the input is parsed by strptime (12 hour time)
)
form_widget_args = dict(
start={'data-date-format': u'yyyy-mm-dd HH:ii P', 'data-show-meridian': 'True'} # changes how the DateTimeField displays the time
)
"""
form_extra_fields = None
"""
Dictionary of additional fields.
Example::
class MyModelView(BaseModelView):
form_extra_fields = {
password: PasswordField('Password')
}
You can control order of form fields using ``form_columns`` property. For example::
class MyModelView(BaseModelView):
form_columns = ('name', 'email', 'password', 'secret')
form_extra_fields = {
password: PasswordField('Password')
}
In this case, password field will be put between email and secret fields that are autogenerated.
"""
form_ajax_refs = None
"""
Use AJAX for foreign key model loading.
Should contain dictionary, where key is field name and value is either a dictionary which
configures AJAX lookups or backend-specific `AjaxModelLoader` class instance.
For example, it can look like::
class MyModelView(BaseModelView):
form_ajax_refs = {
'user': {
'fields': ('first_name', 'last_name', 'email')
'page_size': 10
}
}
Or with SQLAlchemy backend like this::
class MyModelView(BaseModelView):
form_ajax_refs = {
'user': QueryAjaxModelLoader('user', db.session, User, fields=['email'], page_size=10)
}
If you need custom loading functionality, you can implement your custom loading behavior
in your `AjaxModelLoader` class.
"""
form_rules = None
"""
List of rendering rules for model creation form.
This property changed default form rendering behavior and makes possible to rearrange order
of rendered fields, add some text between fields, group them, etc. If not set, will use
default Flask-Admin form rendering logic.
Here's simple example which illustrates how to use::
from flask.ext.admin.form import rules
class MyModelView(ModelView):
form_rules = [
# Define field set with header text and four fields
rules.FieldSet(('first_name', 'last_name', 'email', 'phone'), 'User'),
# ... and it is just shortcut for:
rules.Header('User'),
rules.Field('first_name'),
rules.Field('last_name'),
# ...
# It is possible to create custom rule blocks:
MyBlock('Hello World'),
# It is possible to call macros from current context
rules.Macro('my_macro', foobar='baz')
]
"""
form_edit_rules = None
"""
Customized rules for the edit form. Override `form_rules` if present.
"""
form_create_rules = None
"""
Customized rules for the create form. Override `form_rules` if present.
"""
# Actions
action_disallowed_list = ObsoleteAttr('action_disallowed_list',
'disallowed_actions',
[])
"""
Set of disallowed action names. For example, if you want to disable
mass model deletion, do something like this:
class MyModelView(BaseModelView):
action_disallowed_list = ['delete']
"""
# Various settings
page_size = 20
"""
Default page size for pagination.
"""
def __init__(self, model,
name=None, category=None, endpoint=None, url=None, static_folder=None,
menu_class_name=None, menu_icon_type=None, menu_icon_value=None):
"""
Constructor.
:param model:
Model class
:param name:
View name. If not provided, will use the model class name
:param category:
View category
:param endpoint:
Base endpoint. If not provided, will use the model name + 'view'.
For example if model name was 'User', endpoint will be
'userview'
:param url:
Base URL. If not provided, will use endpoint as a URL.
:param menu_class_name:
Optional class name for the menu item.
:param menu_icon_type:
Optional icon. Possible icon types:
- `flask.ext.admin.consts.ICON_TYPE_GLYPH` - Bootstrap glyph icon
- `flask.ext.admin.consts.ICON_TYPE_IMAGE` - Image relative to Flask static directory
- `flask.ext.admin.consts.ICON_TYPE_IMAGE_URL` - Image with full URL
:param menu_icon_value:
Icon glyph name or URL, depending on `menu_icon_type` setting
"""
# If name not provided, it is model name
if name is None:
name = '%s' % self._prettify_class_name(model.__name__)
# If endpoint not provided, it is model name
if endpoint is None:
endpoint = model.__name__.lower()
super(BaseModelView, self).__init__(name, category, endpoint, url, static_folder,
menu_class_name=menu_class_name,
menu_icon_type=menu_icon_type,
menu_icon_value=menu_icon_value)
self.model = model
# Actions
self.init_actions()
# Scaffolding
self._refresh_cache()
# Caching
def _refresh_forms_cache(self):
# Forms
self._form_ajax_refs = self._process_ajax_references()
if self.form_widget_args is None:
self.form_widget_args = {}
self._create_form_class = self.get_create_form()
self._edit_form_class = self.get_edit_form()
self._delete_form_class = self.get_delete_form()
# List View In-Line Editing
if self.column_editable_list:
self._list_form_class = self.get_list_form()
else:
self.column_editable_list = {}
def _refresh_filters_cache(self):
self._filters = self.get_filters()
if self._filters:
self._filter_groups = OrderedDict()
self._filter_args = {}
for i, flt in enumerate(self._filters):
if flt.name not in self._filter_groups:
self._filter_groups[flt.name] = []
self._filter_groups[flt.name].append({
'index': i,
'arg': self.get_filter_arg(i, flt),
'operation': as_unicode(flt.operation()),
'options': flt.get_options(self) or None,
'type': flt.data_type
})
self._filter_args[self.get_filter_arg(i, flt)] = (i, flt)
else:
self._filter_groups = None
self._filter_args = None
def _refresh_form_rules_cache(self):
if self.form_create_rules:
self._form_create_rules = rules.RuleSet(self, self.form_create_rules)
else:
self._form_create_rules = None
if self.form_edit_rules:
self._form_edit_rules = rules.RuleSet(self, self.form_edit_rules)
else:
self._form_edit_rules = None
if self.form_rules:
form_rules = rules.RuleSet(self, self.form_rules)
if not self._form_create_rules:
self._form_create_rules = form_rules
if not self._form_edit_rules:
self._form_edit_rules = form_rules
def _refresh_cache(self):
"""
Refresh various cached variables.
"""
# List view
self._list_columns = self.get_list_columns()
self._sortable_columns = self.get_sortable_columns()
# Labels
if self.column_labels is None:
self.column_labels = {}
# Forms
self._refresh_forms_cache()
# Search
self._search_supported = self.init_search()
# Choices
if self.column_choices:
self._column_choices_map = dict([
(column, dict(choices))
for column, choices in self.column_choices.items()
])
else:
self.column_choices = self._column_choices_map = dict()
# Type formatters
if self.column_type_formatters is None:
self.column_type_formatters = dict(typefmt.BASE_FORMATTERS)
if self.column_descriptions is None:
self.column_descriptions = dict()
# Filters
self._refresh_filters_cache()
# Form rendering rules
self._refresh_form_rules_cache()
# Primary key
[docs] def get_pk_value(self, model):
"""
Return PK value from a model object.
"""
raise NotImplementedError()
# List view
[docs] def scaffold_list_columns(self):
"""
Return list of the model field names. Must be implemented in
the child class.
Expected return format is list of tuples with field name and
display text. For example::
['name', 'first_name', 'last_name']
"""
raise NotImplementedError('Please implement scaffold_list_columns method')
[docs] def get_column_name(self, field):
"""
Return a human-readable column name.
:param field:
Model field name.
"""
if self.column_labels and field in self.column_labels:
return self.column_labels[field]
else:
return self._prettify_name(field)
[docs] def get_list_columns(self):
"""
Returns a list of the model field names. If `column_list` was
set, returns it. Otherwise calls `scaffold_list_columns`
to generate the list from the model.
"""
columns = self.column_list
if columns is None:
columns = self.scaffold_list_columns()
# Filter excluded columns
if self.column_exclude_list:
columns = [c for c in columns if c not in self.column_exclude_list]
return [(c, self.get_column_name(c)) for c in columns]
[docs] def scaffold_sortable_columns(self):
"""
Returns dictionary of sortable columns. Must be implemented in
the child class.
Expected return format is a dictionary, where keys are field names and
values are property names.
"""
raise NotImplementedError('Please implement scaffold_sortable_columns method')
[docs] def get_sortable_columns(self):
"""
Returns a dictionary of the sortable columns. Key is a model
field name and value is sort column (for example - attribute).
If `column_sortable_list` is set, will use it. Otherwise, will call
`scaffold_sortable_columns` to get them from the model.
"""
if self.column_sortable_list is None:
return self.scaffold_sortable_columns() or dict()
else:
result = dict()
for c in self.column_sortable_list:
if isinstance(c, tuple):
result[c[0]] = c[1]
else:
result[c] = c
return result
[docs] def init_search(self):
"""
Initialize search. If data provider does not support search,
`init_search` will return `False`.
"""
return False
# Filter helpers
[docs] def scaffold_filters(self, name):
"""
Generate filter object for the given name
:param name:
Name of the field
"""
return None
[docs] def is_valid_filter(self, filter):
"""
Verify that the provided filter object is valid.
Override in model backend implementation to verify if
the provided filter type is allowed.
:param filter:
Filter object to verify.
"""
return isinstance(filter, filters.BaseFilter)
[docs] def handle_filter(self, filter):
"""
Postprocess (add joins, etc) for a filter.
:param filter:
Filter object to postprocess
"""
return filter
[docs] def get_filters(self):
"""
Return a list of filter objects.
If your model backend implementation does not support filters,
override this method and return `None`.
"""
if self.column_filters:
collection = []
for n in self.column_filters:
if self.is_valid_filter(n):
collection.append(self.handle_filter(n))
else:
flt = self.scaffold_filters(n)
if flt:
collection.extend(flt)
else:
raise Exception('Unsupported filter type %s' % n)
return collection
else:
return None
[docs] def get_filter_arg(self, index, flt):
"""
Given a filter `flt`, return a unique name for that filter in
this view.
Does not include the `flt[n]_` portion of the filter name.
:param index:
Filter index in _filters array
:param flt:
Filter instance
"""
if self.named_filter_urls:
name = ('%s %s' % (flt.name, as_unicode(flt.operation()))).lower()
name = filter_char_re.sub('', name)
name = filter_compact_re.sub('_', name)
return name
else:
return str(index)
# Form helpers
[docs] def is_sortable(self, name):
"""
Verify if column is sortable.
Not case-sensitive.
:param name:
Column name.
"""
return name.lower() in (x.lower() for x in self._sortable_columns)
[docs] def is_editable(self, name):
"""
Verify if column is editable.
:param name:
Column name.
"""
return name in self.column_editable_list
def _get_column_by_idx(self, idx):
"""
Return column index by
"""
if idx is None or idx < 0 or idx >= len(self._list_columns):
return None
return self._list_columns[idx]
def _get_default_order(self):
"""
Return default sort order
"""
if self.column_default_sort:
if isinstance(self.column_default_sort, tuple):
return self.column_default_sort
else:
return self.column_default_sort, False
return None
# Database-related API
[docs] def get_list(self, page, sort_field, sort_desc, search, filters):
"""
Return a paginated and sorted list of models from the data source.
Must be implemented in the child class.
:param page:
Page number, 0 based. Can be set to None if it is first page.
:param sort_field:
Sort column name or None.
:param sort_desc:
If set to True, sorting is in descending order.
:param search:
Search query
:param filters:
List of filter tuples. First value in a tuple is a search
index, second value is a search value.
"""
raise NotImplementedError('Please implement get_list method')
[docs] def get_one(self, id):
"""
Return one model by its id.
Must be implemented in the child class.
:param id:
Model id
"""
raise NotImplementedError('Please implement get_one method')
# Exception handler
def handle_view_exception(self, exc):
if isinstance(exc, ValidationError):
flash(as_unicode(exc))
return True
if self._debug:
raise
return False
# Model event handlers
[docs] def on_model_change(self, form, model, is_created):
"""
Perform some actions after a model is created or updated.
Called from create_model and update_model in the same transaction
(if it has any meaning for a store backend).
By default does nothing.
:param form:
Form used to create/update model
:param model:
Model that will be created/updated
:param is_created:
Will be set to True if model was created and to False if edited
"""
pass
def _on_model_change(self, form, model, is_created):
"""
Compatibility helper.
"""
try:
self.on_model_change(form, model, is_created)
except TypeError:
msg = ('%s.on_model_change() now accepts third ' +
'parameter is_created. Please update your code') % self.model
warnings.warn(msg)
self.on_model_change(form, model)
[docs] def after_model_change(self, form, model, is_created):
"""
Perform some actions after a model was created or updated and
committed to the database.
Called from create_model after successful database commit.
By default does nothing.
:param form:
Form used to create/update model
:param model:
Model that was created/updated
:param is_created:
True if model was created, False if model was updated
"""
pass
[docs] def on_model_delete(self, model):
"""
Perform some actions before a model is deleted.
Called from delete_model in the same transaction
(if it has any meaning for a store backend).
By default do nothing.
"""
pass
[docs] def create_model(self, form):
"""
Create model from the form.
Returns `True` if operation succeeded.
Must be implemented in the child class.
:param form:
Form instance
"""
raise NotImplementedError()
[docs] def update_model(self, form, model):
"""
Update model from the form.
Returns `True` if operation succeeded.
Must be implemented in the child class.
:param form:
Form instance
:param model:
Model instance
"""
raise NotImplementedError()
[docs] def delete_model(self, model):
"""
Delete model.
Returns `True` if operation succeeded.
Must be implemented in the child class.
:param model:
Model instance
"""
raise NotImplementedError()
# Various helpers
def _prettify_name(self, name):
"""
Prettify pythonic variable name.
For example, 'hello_world' will be converted to 'Hello World'
:param name:
Name to prettify
"""
return prettify_name(name)
def get_empty_list_message(self):
return gettext('There are no items in the table.')
# URL generation helpers
def _get_list_filter_args(self):
if self._filters:
filters = []
for n in request.args:
if not n.startswith('flt'):
continue
if '_' not in n:
continue
pos, key = n[3:].split('_', 1)
if key in self._filter_args:
idx, flt = self._filter_args[key]
value = request.args[n]
if flt.validate(value):
filters.append((pos, (idx, flt.name, value)))
else:
flash(gettext('Invalid Filter Value: %(value)s', value=value))
# Sort filters
return [v[1] for v in sorted(filters, key=lambda n: n[0])]
return None
def _get_list_extra_args(self):
"""
Return arguments from query string.
"""
return ViewArgs(page=request.args.get('page', 0, type=int),
sort=request.args.get('sort', None, type=int),
sort_desc=request.args.get('desc', None, type=int),
search=request.args.get('search', None),
filters=self._get_list_filter_args())
# URL generation helpers
def _get_list_url(self, view_args):
"""
Generate page URL with current page, sort column and
other parameters.
:param view:
View name
:param view_args:
ViewArgs object with page number, filters, etc.
"""
page = view_args.page or None
desc = 1 if view_args.sort_desc else None
kwargs = dict(page=page, sort=view_args.sort, desc=desc, search=view_args.search)
kwargs.update(view_args.extra_args)
if view_args.filters:
for i, pair in enumerate(view_args.filters):
idx, flt_name, value = pair
key = 'flt%d_%s' % (i, self.get_filter_arg(idx, self._filters[idx]))
kwargs[key] = value
return self.get_url('.index_view', **kwargs)
# Actions
[docs] def is_action_allowed(self, name):
"""
Override this method to allow or disallow actions based
on some condition.
The default implementation only checks if the particular action
is not in `action_disallowed_list`.
"""
return name not in self.action_disallowed_list
def _get_field_value(self, model, name):
"""
Get unformatted field value from the model
"""
return rec_getattr(model, name)
@contextfunction
[docs] def get_list_value(self, context, model, name):
"""
Returns the value to be displayed in the list view
:param context:
:py:class:`jinja2.runtime.Context`
:param model:
Model instance
:param name:
Field name
"""
column_fmt = self.column_formatters.get(name)
if column_fmt is not None:
value = column_fmt(self, context, model, name)
else:
value = self._get_field_value(model, name)
choices_map = self._column_choices_map.get(name, {})
if choices_map:
return choices_map.get(value) or value
type_fmt = None
for typeobj, formatter in self.column_type_formatters.items():
if isinstance(value, typeobj):
type_fmt = formatter
break
if type_fmt is not None:
value = type_fmt(self, value)
return value
# AJAX references
def _process_ajax_references(self):
"""
Process `form_ajax_refs` and generate model loaders that
will be used by the `ajax_lookup` view.
"""
result = {}
if self.form_ajax_refs:
for name, options in iteritems(self.form_ajax_refs):
if isinstance(options, dict):
result[name] = self._create_ajax_loader(name, options)
elif isinstance(options, AjaxModelLoader):
result[name] = options
else:
raise ValueError('%s.form_ajax_refs can not handle %s types' % (self, type(options)))
return result
def _create_ajax_loader(self, name, options):
"""
Model backend will override this to implement AJAX model loading.
"""
raise NotImplementedError()
# Views
@expose('/')
[docs] def index_view(self):
"""
List view
"""
if self.column_editable_list:
form = self.list_form()
else:
form = None
if self.can_delete:
delete_form = self.delete_form()
else:
delete_form = None
# Grab parameters from URL
view_args = self._get_list_extra_args()
# Map column index to column name
sort_column = self._get_column_by_idx(view_args.sort)
if sort_column is not None:
sort_column = sort_column[0]
# Get count and data
count, data = self.get_list(view_args.page, sort_column, view_args.sort_desc,
view_args.search, view_args.filters)
# Calculate number of pages
num_pages = count // self.page_size
if count % self.page_size != 0:
num_pages += 1
# Various URL generation helpers
def pager_url(p):
# Do not add page number if it is first page
if p == 0:
p = None
return self._get_list_url(view_args.clone(page=p))
def sort_url(column, invert=False):
desc = None
if invert and not view_args.sort_desc:
desc = 1
return self._get_list_url(view_args.clone(sort=column, sort_desc=desc))
# Actions
actions, actions_confirmation = self.get_actions_list()
clear_search_url = self._get_list_url(view_args.clone(page=0,
sort=view_args.sort,
sort_desc=view_args.sort_desc,
search=None,
filters=None))
return self.render(
self.list_template,
data=data,
form=form,
delete_form=delete_form,
# List
list_columns=self._list_columns,
sortable_columns=self._sortable_columns,
editable_columns=self.column_editable_list,
# Pagination
count=count,
pager_url=pager_url,
num_pages=num_pages,
page=view_args.page,
# Sorting
sort_column=view_args.sort,
sort_desc=view_args.sort_desc,
sort_url=sort_url,
# Search
search_supported=self._search_supported,
clear_search_url=clear_search_url,
search=view_args.search,
# Filters
filters=self._filters,
filter_groups=self._filter_groups,
active_filters=view_args.filters,
# Actions
actions=actions,
actions_confirmation=actions_confirmation,
# Misc
enumerate=enumerate,
get_pk_value=self.get_pk_value,
get_value=self.get_list_value,
return_url=self._get_list_url(view_args),
)
@expose('/new/', methods=('GET', 'POST'))
[docs] def create_view(self):
"""
Create model view
"""
return_url = get_redirect_target() or self.get_url('.index_view')
if not self.can_create:
return redirect(return_url)
form = self.create_form()
if self.validate_form(form):
if self.create_model(form):
if '_add_another' in request.form:
flash(gettext('Record was successfully created.'))
return redirect(request.url)
else:
return redirect(return_url)
form_opts = FormOpts(widget_args=self.form_widget_args,
form_rules=self._form_create_rules)
return self.render(self.create_template,
form=form,
form_opts=form_opts,
return_url=return_url)
@expose('/edit/', methods=('GET', 'POST'))
[docs] def edit_view(self):
"""
Edit model view
"""
return_url = get_redirect_target() or self.get_url('.index_view')
if not self.can_edit:
return redirect(return_url)
id = get_mdict_item_or_list(request.args, 'id')
if id is None:
return redirect(return_url)
model = self.get_one(id)
if model is None:
return redirect(return_url)
form = self.edit_form(obj=model)
if self.validate_form(form):
if self.update_model(form, model):
if '_continue_editing' in request.form:
flash(gettext('Record was successfully saved.'))
return redirect(request.url)
else:
return redirect(return_url)
if request.method == 'GET':
self.on_form_prefill(form, id)
form_opts = FormOpts(widget_args=self.form_widget_args,
form_rules=self._form_edit_rules)
return self.render(self.edit_template,
model=model,
form=form,
form_opts=form_opts,
return_url=return_url)
@expose('/delete/', methods=('POST',))
[docs] def delete_view(self):
"""
Delete model view. Only POST method is allowed.
"""
return_url = get_redirect_target() or self.get_url('.index_view')
if not self.can_delete:
return redirect(return_url)
form = self.delete_form()
if self.validate_form(form):
# id is Required()
id = form.id.data
model = self.get_one(id)
if model is None:
return redirect(return_url)
# message is flashed from within delete_model if it fails
if self.delete_model(model):
flash(gettext('Record was successfully deleted.'))
return redirect(return_url)
else:
flash_errors(form, message='Failed to delete record. %(error)s')
return redirect(return_url)
@expose('/action/', methods=('POST',))
[docs] def action_view(self):
"""
Mass-model action view.
"""
return self.handle_action()
@expose('/ajax/lookup/')
def ajax_lookup(self):
name = request.args.get('name')
query = request.args.get('query')
offset = request.args.get('offset', type=int)
limit = request.args.get('limit', 10, type=int)
loader = self._form_ajax_refs.get(name)
if not loader:
abort(404)
data = [loader.format(m) for m in loader.get_list(query, offset, limit)]
return Response(json.dumps(data), mimetype='application/json')
@expose('/ajax/update/', methods=('POST',))
[docs] def ajax_update(self):
"""
Edits a single column of a record in list view.
"""
if not self.column_editable_list:
abort(404)
record = None
form = self.list_form()
# prevent validation issues due to submitting a single field
# delete all fields except the field being submitted
for field in form:
# only the submitted field has a positive last_index
if getattr(field, 'last_index', 0):
record = self.get_one(str(field.last_index))
elif field.name == 'csrf_token':
pass
else:
form.__delitem__(field.name)
if record is None:
return gettext('Failed to update record. %(error)s', error=''), 500
if self.validate_form(form):
if self.update_model(form, record):
# Success
return gettext('Record was successfully saved.')
else:
# Error: No records changed, or problem saving to database.
msgs = ", ".join([msg for msg in get_flashed_messages()])
return gettext('Failed to update record. %(error)s',
error=msgs), 500
else:
for field in form:
for error in field.errors:
# return validation error to x-editable
if isinstance(error, list):
return ", ".join(error), 500
else:
return error, 500
