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
)
class LayoutField(object):
def layout(self, x, **kwargs):
return layout.Field(x, **kwargs)
class CheckboxesLayoutField(object):
def layout(self, x, **kwargs):
return bootstrap.InlineCheckboxes(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)
class ModelMultipleChoiceFilter(forms.ModelMultipleChoiceField, CheckboxesLayoutField):
def __init__(self, label, queryset, key, lookup, human_values={}, **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
def label_from_instance(self, obj):
return self.human_values.get(obj.__dict__[self.key], obj.__dict__[self.key])
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)
# MultiValueField is an abstract class, must be subclassed and implement compress
class ComboFilter(forms.MultiValueField, LayoutField):
# MultiWidget is an abstract class, must be subclassed and implement decompress
class ComboWidget(forms.widgets.MultiWidget):
def decompress(self, value):
return value if value else [None for i in range(len(self.widgets))]
def layout(self, x, **kwargs):
attrs = []
for i, field in enumerate(self.fields):
cls = ['col-sm-3']
if i < len(self.fields) - 1:
cls.append('mr-4')
if type(field) == SwitchField:
cls += ['custom-switch']
elif type(field) == ModelChoiceFilter:
cls.append('custom-select')
elif type(field) == SingleRegexFilter:
cls.append('form-control')
attrs.append({'class' : ' '.join(cls)})
return layout.MultiWidgetField(x, attrs=attrs, **kwargs)
def __init__(self, label, inner_class, outer_lookup, fields, negation_field=False, **kwargs):
neg_fields = [SwitchField('!')] if negation_field else []
all_fields = neg_fields + fields
super().__init__(
label=label,
fields=all_fields,
widget=self.ComboWidget(widgets=[field.widget for field in all_fields]),
required=False,
**kwargs
)
self.query_fields = fields
self.query_manager = ComboQueryManager(inner_class, outer_lookup, [f.query_manager for f in fields], negation_field)
def compress(self, data_list):
return data_list
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):
super().__init__(label=label, required=False)
def layout(self, x, **kwargs):
return layout.Field(x, wrapper_class='custom-switch float-right font-weight-bold', **kwargs)