import logging
from flask import flash
from flask_admin._compat import string_types
from flask_admin.babel import gettext, ngettext, lazy_gettext
from flask_admin.model import BaseModelView
from flask_admin.model.form import create_editable_list_form
from peewee import JOIN, PrimaryKeyField, ForeignKeyField, Field, CharField, TextField
from flask_admin.actions import action
from flask_admin.contrib.peewee import filters
from .form import get_form, CustomModelConverter, InlineModelConverter, save_inline
from .tools import get_meta_fields, get_primary_key, parse_like_term
from .ajax import create_ajax_loader
# Set up logger
log = logging.getLogger("flask-admin.peewee")
[docs]class ModelView(BaseModelView):
column_filters = None
"""
Collection of the column filters.
Can contain either field names or instances of
:class:`flask_admin.contrib.peewee.filters.BasePeeweeFilter` classes.
Filters will be grouped by name when displayed in the drop-down.
For example::
class MyModelView(BaseModelView):
column_filters = ('user', 'email')
or::
from flask_admin.contrib.peewee.filters import BooleanEqualFilter
class MyModelView(BaseModelView):
column_filters = (BooleanEqualFilter(column=User.name, name='Name'),)
or::
from flask_admin.contrib.peewee.filters import BasePeeweeFilter
class FilterLastNameBrown(BasePeeweeFilter):
def apply(self, query, value):
if value == '1':
return query.filter(self.column == "Brown")
else:
return query.filter(self.column != "Brown")
def operation(self):
return 'is Brown'
class MyModelView(BaseModelView):
column_filters = [
FilterLastNameBrown(
column=User.last_name, name='Last Name',
options=(('1', 'Yes'), ('0', 'No'))
)
]
"""
model_form_converter = CustomModelConverter
"""
Model form conversion class. Use this to implement custom field conversion logic.
For example::
class MyModelConverter(AdminModelConverter):
pass
class MyAdminView(ModelView):
model_form_converter = MyModelConverter
"""
inline_model_form_converter = InlineModelConverter
"""
Inline model conversion class. If you need some kind of post-processing for inline
forms, you can customize behavior by doing something like this::
class MyInlineModelConverter(AdminModelConverter):
def post_process(self, form_class, info):
form_class.value = TextField('value')
return form_class
class MyAdminView(ModelView):
inline_model_form_converter = MyInlineModelConverter
"""
filter_converter = filters.FilterConverter()
"""
Field to filter converter.
Override this attribute to use non-default converter.
"""
fast_mass_delete = False
"""
If set to `False` and user deletes more than one model using actions,
all models will be read from the database and then deleted one by one
giving Peewee chance to manually cleanup any dependencies (many-to-many
relationships, etc).
If set to True, will run DELETE statement which is somewhat faster, but
might leave corrupted data if you forget to configure DELETE CASCADE
for your model.
"""
inline_models = None
"""
Inline related-model editing for models with parent to child relation.
Accept enumerable with one of the values:
1. Child model class::
class MyModelView(ModelView):
inline_models = (Post,)
2. Child model class and additional options::
class MyModelView(ModelView):
inline_models = [(Post, dict(form_columns=['title']))]
3. Django-like ``InlineFormAdmin`` class instance::
from flask_admin.model.form import InlineFormAdmin
class MyInlineModelForm(InlineFormAdmin):
form_columns = ('title', 'date')
class MyModelView(ModelView):
inline_models = (MyInlineModelForm(MyInlineModel),)
You can customize generated field name by:
1. Using `form_name` property as option:
class MyModelView(ModelView):
inline_models = ((Post, dict(form_label='Hello')))
2. Using field's related_name:
class Model1(Base):
# ...
pass
class Model2(Base):
# ...
model1 = ForeignKeyField(related_name="model_twos")
class MyModel1View(Base):
inline_models = (Model2,)
column_labels = {'model_ones': 'Hello'}
"""
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):
self._search_fields = []
super(ModelView, self).__init__(model, 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._primary_key = self.scaffold_pk()
def _get_model_fields(self, model=None):
if model is None:
model = self.model
return (
(field.name, field)
for field in get_meta_fields(model))
def scaffold_pk(self):
return get_primary_key(self.model)
[docs] def get_pk_value(self, model):
if self.model._meta.composite_key:
return tuple([
getattr(model, field_name)
for field_name in self.model._meta.primary_key.field_names])
return getattr(model, self._primary_key)
[docs] def scaffold_list_columns(self):
columns = []
for n, f in self._get_model_fields():
if isinstance(f, ForeignKeyField):
columns.append(n)
elif self.column_display_pk or not isinstance(f, PrimaryKeyField):
columns.append(n)
return columns
[docs] def scaffold_sortable_columns(self):
columns = dict()
for n, f in self._get_model_fields():
if self.column_display_pk or not isinstance(f, PrimaryKeyField):
columns[n] = f
return columns
[docs] def init_search(self):
if self.column_searchable_list:
for p in self.column_searchable_list:
if isinstance(p, string_types):
p = getattr(self.model, p)
# Check type
if not isinstance(p, (CharField, TextField)):
raise Exception(f'Can only search on text columns. Failed to setup search for "{p}"')
self._search_fields.append(p)
return bool(self._search_fields)
[docs] def scaffold_filters(self, name):
if isinstance(name, string_types):
attr = getattr(self.model, name, None)
else:
attr = name
if attr is None:
raise Exception('Failed to find field for filter: %s' % name)
# Check if field is in different model
model_class = None
try:
model_class = attr.model_class
except AttributeError:
model_class = attr.model
if model_class != self.model:
visible_name = '%s / %s' % (self.get_column_name(model_class.__name__),
self.get_column_name(attr.name))
else:
if not isinstance(name, string_types):
visible_name = self.get_column_name(attr.name)
else:
visible_name = self.get_column_name(name)
type_name = type(attr).__name__
flt = self.filter_converter.convert(type_name,
attr,
visible_name)
return flt
[docs] def is_valid_filter(self, filter):
return isinstance(filter, filters.BasePeeweeFilter)
def scaffold_inline_form_models(self, form_class):
converter = self.model_form_converter(self)
inline_converter = self.inline_model_form_converter(self)
for m in self.inline_models:
form_class = inline_converter.contribute(converter,
self.model,
form_class,
m)
return form_class
# AJAX foreignkey support
def _create_ajax_loader(self, name, options):
return create_ajax_loader(self.model, name, name, options)
def _handle_join(self, query, field, joins):
model_class = None
try:
model_class = field.model_class
except AttributeError:
model_class = field.model
if model_class != self.model:
model_name = model_class.__name__
if model_name not in joins:
query = query.join(model_class, JOIN.LEFT_OUTER)
joins.add(model_name)
return query
def _order_by(self, query, joins, order):
clauses = []
for sort_field, sort_desc in order:
query, joins, clause = self._sort_clause(
query, joins, sort_field, sort_desc)
clauses.append(clause)
query = query.order_by(*clauses)
return query, joins
def _sort_clause(self, query, joins, sort_field, sort_desc):
if isinstance(sort_field, string_types):
field = getattr(self.model, sort_field)
elif isinstance(sort_field, Field):
model_class = None
try:
model_class = sort_field.model_class
except AttributeError:
model_class = sort_field.model
if model_class != self.model:
query = self._handle_join(query, sort_field, joins)
field = sort_field
clause = field.desc() if sort_desc else field.asc()
return query, joins, clause
def get_query(self):
return self.model.select()
[docs] def get_list(self, page, sort_column, sort_desc, search, filters,
execute=True, page_size=None):
"""
Return records from the database.
:param page:
Page number
:param sort_column:
Sort column name
:param sort_desc:
Descending or ascending sort
:param search:
Search query
:param filters:
List of filter tuples
:param execute:
Execute query immediately? Default is `True`
:param page_size:
Number of results. Defaults to ModelView's page_size. Can be
overriden to change the page_size limit. Removing the page_size
limit requires setting page_size to 0 or False.
"""
query = self.get_query()
joins = set()
# Search
if self._search_supported and search:
values = search.split(' ')
for value in values:
if not value:
continue
term = parse_like_term(value)
stmt = None
for field in self._search_fields:
query = self._handle_join(query, field, joins)
q = field ** term
if stmt is None:
stmt = q
else:
stmt |= q
query = query.where(stmt)
# Filters
if self._filters:
for flt, flt_name, value in filters:
f = self._filters[flt]
query = self._handle_join(query, f.column, joins)
query = f.apply(query, f.clean(value))
# Get count
count = query.count() if not self.simple_list_pager else None
# Apply sorting
if sort_column is not None:
sort_field = self._sortable_columns[sort_column]
order = [(sort_field, sort_desc)]
query, joins = self._order_by(query, joins, order)
else:
order = self._get_default_order()
if order:
query, joins = self._order_by(query, joins, order)
# Pagination
if page_size is None:
page_size = self.page_size
if page_size:
query = query.limit(page_size)
if page and page_size:
query = query.offset(page * page_size)
if execute:
query = list(query.execute())
return count, query
[docs] def get_one(self, id):
if self.model._meta.composite_key:
return self.model.get(**dict(zip(self.model._meta.primary_key.field_names, id)))
return self.model.get(**{self._primary_key: id})
[docs] def create_model(self, form):
try:
model = self.model()
form.populate_obj(model)
self._on_model_change(form, model, True)
model.save(force_insert=True)
# For peewee have to save inline forms after model was saved
save_inline(form, model)
except Exception as ex:
if not self.handle_view_exception(ex):
flash(gettext('Failed to create record. %(error)s', error=str(ex)), 'error')
log.exception('Failed to create record.')
return False
else:
self.after_model_change(form, model, True)
return model
[docs] def update_model(self, form, model):
try:
form.populate_obj(model)
self._on_model_change(form, model, False)
model.save()
# For peewee have to save inline forms after model was saved
save_inline(form, model)
except Exception as ex:
if not self.handle_view_exception(ex):
flash(gettext('Failed to update record. %(error)s', error=str(ex)), 'error')
log.exception('Failed to update record.')
return False
else:
self.after_model_change(form, model, False)
return True
[docs] def delete_model(self, model):
try:
self.on_model_delete(model)
model.delete_instance(recursive=True)
except Exception as ex:
if not self.handle_view_exception(ex):
flash(gettext('Failed to delete record. %(error)s', error=str(ex)), 'error')
log.exception('Failed to delete record.')
return False
else:
self.after_model_delete(model)
return True
# Default model actions
[docs] def is_action_allowed(self, name):
# Check delete action permission
if name == 'delete' and not self.can_delete:
return False
return super(ModelView, self).is_action_allowed(name)
@action('delete',
lazy_gettext('Delete'),
lazy_gettext('Are you sure you want to delete selected records?'))
def action_delete(self, ids):
try:
model_pk = getattr(self.model, self._primary_key)
if self.fast_mass_delete:
count = self.model.delete().where(model_pk << ids).execute()
else:
count = 0
query = self.model.select().filter(model_pk << ids)
for m in query:
self.on_model_delete(m)
m.delete_instance(recursive=True)
count += 1
flash(ngettext('Record was successfully deleted.',
'%(count)s records were successfully deleted.',
count,
count=count), 'success')
except Exception as ex:
if not self.handle_view_exception(ex):
flash(gettext('Failed to delete records. %(error)s', error=str(ex)), 'error')
