generic_fields.py
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from django import forms
from django.db.models import Q
# TODO: import particular classes?
import crispy_forms.bootstrap as bootstrap
import crispy_forms.layout as layout
from .query_managers import (
SingleValueQueryManager,
MultiValueQueryManager,
RangesQueryManager,
SingleRegexQueryManager,
RegexQueryManager,
ComboQueryManager
)
bootstrap.InlineCheckboxes.template = 'checkboxselectmultiple_inline_with_tooltips.html'
class LayoutField(object):
def layout(self, x, **kwargs):
return layout.Field(x, **kwargs)
class CheckboxesLayoutField(object):
def layout(self, x, **kwargs):
if self.checkboxes:
return bootstrap.InlineCheckboxes(x, **kwargs)
else:
return layout.Field(x, **kwargs)
class RadiosLayoutField(object):
def layout(self, x, **kwargs):
return bootstrap.InlineRadios(x, **kwargs)
class SelectLayoutField(object):
def layout(self, x, **kwargs):
return layout.Field(x, css_class='custom-select', **kwargs)
# ==============================================================================
#TODO move implementation common for RangesFilter and RegexFilter to an abstract ExpressionFilter?
class RangeFilter(forms.CharField, LayoutField):
def __init__(self, label, lookup, initial='', empty_value='', **kwargs):
super().__init__(label=label, required=False, initial=initial, empty_value=empty_value, **kwargs)
self.query_manager = RangesQueryManager(lookup)
# can’t use static default_validators since the query manager is a class field
def validate(self, value):
self.query_manager.expression_validator(value)
class RegexFilter(forms.CharField, LayoutField):
def __init__(self, label, lookup, additional_operators=False, initial='.*', empty_value='.*', autocomplete=None, **kwargs):
self.css_class = 'regex-autocomplete' if autocomplete else None
self.data_autocomplete = autocomplete if autocomplete else None
super().__init__(label=label, required=False, initial=initial, empty_value=empty_value, **kwargs)
self.query_manager = RegexQueryManager(lookup, additional_operators=additional_operators)
# can’t use static default_validators since validation depends on the
# query_manager instance (allowed operators)
def validate(self, value):
self.query_manager.expression_validator(value)
def layout(self, x, **kwargs):
return layout.Field(x, css_class=self.css_class, data_autocomplete=self.data_autocomplete, **kwargs)
class SingleRegexFilter(forms.CharField, LayoutField):
def __init__(self, label, lookup, initial='.*', empty_value='.*', **kwargs):
super().__init__(label=label, required=False, initial=initial, empty_value=empty_value, **kwargs)
self.query_manager = SingleRegexQueryManager(lookup)
class MultipleChoiceFilter(forms.MultipleChoiceField, CheckboxesLayoutField):
def __init__(self, label, choices, lookup, **kwargs):
super().__init__(
label=label,
choices=choices,
required=False,
**kwargs
)
self.query_manager = MultiValueQueryManager(lookup, default_conjunction=False)
self.checkboxes = True
def valid_value(self, value):
text_value = str(value)
# ignore the optional help tooltip provided in choices, only compare with the key
for k, (v, help) in self.choices:
print(k, value)
if value == k or text_value == str(k):
return True
return False
class ModelMultipleChoiceFilter(forms.ModelMultipleChoiceField, CheckboxesLayoutField):
def __init__(self, label, queryset, key, lookup, human_values={}, checkboxes=True, **kwargs):
super().__init__(
label=label,
queryset=queryset,
required=False,
**kwargs
)
self.query_manager = MultiValueQueryManager(lookup, default_conjunction=False)
self.key = key
self.human_values = human_values
self.checkboxes = checkboxes
def label_from_instance(self, obj):
val = self.human_values.get(obj.__dict__[self.key], obj.__dict__[self.key])
if self.checkboxes:
if type(val) == tuple:
return val
else:
return (val, None)
else:
if type(val) == tuple:
return '{} ({})'.format(val[1], val[0])
else:
return val
class ChoiceFilter(forms.ChoiceField, SelectLayoutField):
def __init__(self, label, choices, **kwargs):
super().__init__(
label=label,
choices=choices,
required=False,
**kwargs
)
class ModelChoiceFilter(forms.ModelChoiceField, SelectLayoutField):
def __init__(self, label, queryset, key, lookup, human_values={}, **kwargs):
super().__init__(
label=label,
queryset=queryset,
required=False,
**kwargs
)
self.query_manager = SingleValueQueryManager(lookup)
# str object or callable
self.key = key
self.human_values = human_values
def label_from_instance(self, obj):
if type(self.key) == str:
return self.human_values.get(obj.__dict__[self.key], obj.__dict__[self.key])
else:
return self.key(obj)
class OperatorField(forms.ChoiceField, RadiosLayoutField):
def __init__(self):
super().__init__(
label=' ',
choices=((False, 'lub'), (True, 'i')),
initial=False,
required=False,
)
def to_python(self, value):
if value in ('1', 'true', 'True', True):
return True
if value in ('0', 'false', 'False', False):
return False
return None
class SwitchField(forms.BooleanField, LayoutField):
def __init__(self, label, css_class=None):
super().__init__(label=label, required=False)
self.css_class = css_class
def layout(self, x, **kwargs):
wrapper_class = 'custom-switch float-right font-weight-bold'
if self.css_class:
wrapper_class += ' ' + self.css_class
return layout.Field(x, wrapper_class=wrapper_class, **kwargs)