author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 00:53:11 +0530 | |
changeset 348 | 1eb24b1662cf |
parent 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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1 |
from forms import Form |
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from django.core.exceptions import ValidationError |
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from django.utils.encoding import StrAndUnicode |
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from django.utils.safestring import mark_safe |
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from django.utils.translation import ugettext as _ |
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from fields import IntegerField, BooleanField |
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from widgets import Media, HiddenInput |
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from util import ErrorList |
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|
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__all__ = ('BaseFormSet', 'all_valid') |
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|
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# special field names |
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TOTAL_FORM_COUNT = 'TOTAL_FORMS' |
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INITIAL_FORM_COUNT = 'INITIAL_FORMS' |
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MAX_NUM_FORM_COUNT = 'MAX_NUM_FORMS' |
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ORDERING_FIELD_NAME = 'ORDER' |
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DELETION_FIELD_NAME = 'DELETE' |
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|
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class ManagementForm(Form): |
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""" |
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``ManagementForm`` is used to keep track of how many form instances |
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are displayed on the page. If adding new forms via javascript, you should |
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increment the count field of this form as well. |
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""" |
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def __init__(self, *args, **kwargs): |
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self.base_fields[TOTAL_FORM_COUNT] = IntegerField(widget=HiddenInput) |
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self.base_fields[INITIAL_FORM_COUNT] = IntegerField(widget=HiddenInput) |
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self.base_fields[MAX_NUM_FORM_COUNT] = IntegerField(required=False, widget=HiddenInput) |
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super(ManagementForm, self).__init__(*args, **kwargs) |
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|
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class BaseFormSet(StrAndUnicode): |
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""" |
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A collection of instances of the same Form class. |
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""" |
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def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None, |
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initial=None, error_class=ErrorList): |
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self.is_bound = data is not None or files is not None |
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self.prefix = prefix or self.get_default_prefix() |
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self.auto_id = auto_id |
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self.data = data |
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self.files = files |
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self.initial = initial |
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self.error_class = error_class |
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self._errors = None |
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self._non_form_errors = None |
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# construct the forms in the formset |
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self._construct_forms() |
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|
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def __unicode__(self): |
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return self.as_table() |
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|
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def _management_form(self): |
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"""Returns the ManagementForm instance for this FormSet.""" |
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if self.data or self.files: |
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form = ManagementForm(self.data, auto_id=self.auto_id, prefix=self.prefix) |
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if not form.is_valid(): |
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raise ValidationError('ManagementForm data is missing or has been tampered with') |
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else: |
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form = ManagementForm(auto_id=self.auto_id, prefix=self.prefix, initial={ |
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TOTAL_FORM_COUNT: self.total_form_count(), |
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INITIAL_FORM_COUNT: self.initial_form_count(), |
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MAX_NUM_FORM_COUNT: self.max_num |
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}) |
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return form |
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management_form = property(_management_form) |
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|
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def total_form_count(self): |
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"""Returns the total number of forms in this FormSet.""" |
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if self.data or self.files: |
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return self.management_form.cleaned_data[TOTAL_FORM_COUNT] |
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else: |
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initial_forms = self.initial_form_count() |
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total_forms = initial_forms + self.extra |
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# Allow all existing related objects/inlines to be displayed, |
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# but don't allow extra beyond max_num. |
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if initial_forms > self.max_num >= 0: |
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total_forms = initial_forms |
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elif total_forms > self.max_num >= 0: |
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total_forms = self.max_num |
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return total_forms |
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def initial_form_count(self): |
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"""Returns the number of forms that are required in this FormSet.""" |
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if self.data or self.files: |
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return self.management_form.cleaned_data[INITIAL_FORM_COUNT] |
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else: |
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# Use the length of the inital data if it's there, 0 otherwise. |
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initial_forms = self.initial and len(self.initial) or 0 |
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if initial_forms > self.max_num >= 0: |
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initial_forms = self.max_num |
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return initial_forms |
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def _construct_forms(self): |
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# instantiate all the forms and put them in self.forms |
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self.forms = [] |
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for i in xrange(self.total_form_count()): |
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self.forms.append(self._construct_form(i)) |
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|
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def _construct_form(self, i, **kwargs): |
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""" |
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Instantiates and returns the i-th form instance in a formset. |
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""" |
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defaults = {'auto_id': self.auto_id, 'prefix': self.add_prefix(i)} |
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if self.data or self.files: |
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defaults['data'] = self.data |
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defaults['files'] = self.files |
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if self.initial: |
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try: |
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defaults['initial'] = self.initial[i] |
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except IndexError: |
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pass |
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# Allow extra forms to be empty. |
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113 |
if i >= self.initial_form_count(): |
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defaults['empty_permitted'] = True |
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defaults.update(kwargs) |
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116 |
form = self.form(**defaults) |
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117 |
self.add_fields(form, i) |
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118 |
return form |
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119 |
|
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120 |
def _get_initial_forms(self): |
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121 |
"""Return a list of all the initial forms in this formset.""" |
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122 |
return self.forms[:self.initial_form_count()] |
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123 |
initial_forms = property(_get_initial_forms) |
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124 |
|
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125 |
def _get_extra_forms(self): |
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126 |
"""Return a list of all the extra forms in this formset.""" |
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127 |
return self.forms[self.initial_form_count():] |
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128 |
extra_forms = property(_get_extra_forms) |
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129 |
|
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130 |
def _get_empty_form(self, **kwargs): |
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131 |
defaults = { |
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132 |
'auto_id': self.auto_id, |
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133 |
'prefix': self.add_prefix('__prefix__'), |
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134 |
'empty_permitted': True, |
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135 |
} |
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136 |
if self.data or self.files: |
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137 |
defaults['data'] = self.data |
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138 |
defaults['files'] = self.files |
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139 |
defaults.update(kwargs) |
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140 |
form = self.form(**defaults) |
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141 |
self.add_fields(form, None) |
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142 |
return form |
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143 |
empty_form = property(_get_empty_form) |
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144 |
|
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145 |
# Maybe this should just go away? |
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146 |
def _get_cleaned_data(self): |
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147 |
""" |
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148 |
Returns a list of form.cleaned_data dicts for every form in self.forms. |
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149 |
""" |
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150 |
if not self.is_valid(): |
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151 |
raise AttributeError("'%s' object has no attribute 'cleaned_data'" % self.__class__.__name__) |
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152 |
return [form.cleaned_data for form in self.forms] |
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153 |
cleaned_data = property(_get_cleaned_data) |
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154 |
|
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155 |
def _get_deleted_forms(self): |
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156 |
""" |
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157 |
Returns a list of forms that have been marked for deletion. Raises an |
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158 |
AttributeError if deletion is not allowed. |
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159 |
""" |
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160 |
if not self.is_valid() or not self.can_delete: |
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161 |
raise AttributeError("'%s' object has no attribute 'deleted_forms'" % self.__class__.__name__) |
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162 |
# construct _deleted_form_indexes which is just a list of form indexes |
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163 |
# that have had their deletion widget set to True |
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164 |
if not hasattr(self, '_deleted_form_indexes'): |
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165 |
self._deleted_form_indexes = [] |
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166 |
for i in range(0, self.total_form_count()): |
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167 |
form = self.forms[i] |
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168 |
# if this is an extra form and hasn't changed, don't consider it |
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169 |
if i >= self.initial_form_count() and not form.has_changed(): |
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170 |
continue |
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171 |
if self._should_delete_form(form): |
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172 |
self._deleted_form_indexes.append(i) |
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173 |
return [self.forms[i] for i in self._deleted_form_indexes] |
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174 |
deleted_forms = property(_get_deleted_forms) |
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175 |
|
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176 |
def _get_ordered_forms(self): |
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177 |
""" |
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178 |
Returns a list of form in the order specified by the incoming data. |
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179 |
Raises an AttributeError if ordering is not allowed. |
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180 |
""" |
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|
181 |
if not self.is_valid() or not self.can_order: |
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|
182 |
raise AttributeError("'%s' object has no attribute 'ordered_forms'" % self.__class__.__name__) |
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|
183 |
# Construct _ordering, which is a list of (form_index, order_field_value) |
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|
184 |
# tuples. After constructing this list, we'll sort it by order_field_value |
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|
185 |
# so we have a way to get to the form indexes in the order specified |
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|
186 |
# by the form data. |
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|
187 |
if not hasattr(self, '_ordering'): |
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|
188 |
self._ordering = [] |
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|
189 |
for i in range(0, self.total_form_count()): |
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|
190 |
form = self.forms[i] |
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|
191 |
# if this is an extra form and hasn't changed, don't consider it |
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|
192 |
if i >= self.initial_form_count() and not form.has_changed(): |
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|
193 |
continue |
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|
194 |
# don't add data marked for deletion to self.ordered_data |
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|
195 |
if self.can_delete and self._should_delete_form(form): |
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|
196 |
continue |
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|
197 |
self._ordering.append((i, form.cleaned_data[ORDERING_FIELD_NAME])) |
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|
198 |
# After we're done populating self._ordering, sort it. |
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|
199 |
# A sort function to order things numerically ascending, but |
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|
200 |
# None should be sorted below anything else. Allowing None as |
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|
201 |
# a comparison value makes it so we can leave ordering fields |
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|
202 |
# blamk. |
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|
203 |
def compare_ordering_values(x, y): |
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|
204 |
if x[1] is None: |
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|
205 |
return 1 |
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|
206 |
if y[1] is None: |
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|
207 |
return -1 |
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|
208 |
return x[1] - y[1] |
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|
209 |
self._ordering.sort(compare_ordering_values) |
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|
210 |
# Return a list of form.cleaned_data dicts in the order spcified by |
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|
211 |
# the form data. |
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|
212 |
return [self.forms[i[0]] for i in self._ordering] |
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|
213 |
ordered_forms = property(_get_ordered_forms) |
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|
214 |
|
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|
215 |
#@classmethod |
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|
216 |
def get_default_prefix(cls): |
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|
217 |
return 'form' |
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|
218 |
get_default_prefix = classmethod(get_default_prefix) |
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219 |
|
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220 |
def non_form_errors(self): |
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221 |
""" |
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|
222 |
Returns an ErrorList of errors that aren't associated with a particular |
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223 |
form -- i.e., from formset.clean(). Returns an empty ErrorList if there |
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|
224 |
are none. |
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225 |
""" |
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|
226 |
if self._non_form_errors is not None: |
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|
227 |
return self._non_form_errors |
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|
228 |
return self.error_class() |
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|
229 |
|
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|
230 |
def _get_errors(self): |
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231 |
""" |
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232 |
Returns a list of form.errors for every form in self.forms. |
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233 |
""" |
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234 |
if self._errors is None: |
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235 |
self.full_clean() |
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236 |
return self._errors |
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237 |
errors = property(_get_errors) |
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238 |
|
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239 |
def _should_delete_form(self, form): |
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240 |
# The way we lookup the value of the deletion field here takes |
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|
241 |
# more code than we'd like, but the form's cleaned_data will |
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242 |
# not exist if the form is invalid. |
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|
243 |
field = form.fields[DELETION_FIELD_NAME] |
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244 |
raw_value = form._raw_value(DELETION_FIELD_NAME) |
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245 |
should_delete = field.clean(raw_value) |
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246 |
return should_delete |
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247 |
|
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248 |
def is_valid(self): |
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249 |
""" |
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250 |
Returns True if form.errors is empty for every form in self.forms. |
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251 |
""" |
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252 |
if not self.is_bound: |
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253 |
return False |
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254 |
# We loop over every form.errors here rather than short circuiting on the |
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255 |
# first failure to make sure validation gets triggered for every form. |
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256 |
forms_valid = True |
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257 |
err = self.errors |
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258 |
for i in range(0, self.total_form_count()): |
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259 |
form = self.forms[i] |
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260 |
if self.can_delete: |
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261 |
if self._should_delete_form(form): |
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262 |
# This form is going to be deleted so any of its errors |
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263 |
# should not cause the entire formset to be invalid. |
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264 |
continue |
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265 |
if bool(self.errors[i]): |
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266 |
forms_valid = False |
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267 |
return forms_valid and not bool(self.non_form_errors()) |
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268 |
|
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269 |
def full_clean(self): |
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270 |
""" |
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271 |
Cleans all of self.data and populates self._errors. |
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272 |
""" |
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|
273 |
self._errors = [] |
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274 |
if not self.is_bound: # Stop further processing. |
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275 |
return |
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|
276 |
for i in range(0, self.total_form_count()): |
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277 |
form = self.forms[i] |
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|
278 |
self._errors.append(form.errors) |
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|
279 |
# Give self.clean() a chance to do cross-form validation. |
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|
280 |
try: |
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|
281 |
self.clean() |
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|
282 |
except ValidationError, e: |
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|
283 |
self._non_form_errors = self.error_class(e.messages) |
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284 |
|
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|
285 |
def clean(self): |
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286 |
""" |
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|
287 |
Hook for doing any extra formset-wide cleaning after Form.clean() has |
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|
288 |
been called on every form. Any ValidationError raised by this method |
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|
289 |
will not be associated with a particular form; it will be accesible |
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290 |
via formset.non_form_errors() |
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|
291 |
""" |
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|
292 |
pass |
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293 |
|
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294 |
def add_fields(self, form, index): |
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|
295 |
"""A hook for adding extra fields on to each form instance.""" |
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|
296 |
if self.can_order: |
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|
297 |
# Only pre-fill the ordering field for initial forms. |
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|
298 |
if index is not None and index < self.initial_form_count(): |
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|
299 |
form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_(u'Order'), initial=index+1, required=False) |
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|
300 |
else: |
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|
301 |
form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_(u'Order'), required=False) |
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|
302 |
if self.can_delete: |
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|
303 |
form.fields[DELETION_FIELD_NAME] = BooleanField(label=_(u'Delete'), required=False) |
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|
304 |
|
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|
305 |
def add_prefix(self, index): |
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|
306 |
return '%s-%s' % (self.prefix, index) |
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|
307 |
|
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|
308 |
def is_multipart(self): |
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|
309 |
""" |
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|
310 |
Returns True if the formset needs to be multipart-encrypted, i.e. it |
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|
311 |
has FileInput. Otherwise, False. |
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|
312 |
""" |
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|
313 |
return self.forms and self.forms[0].is_multipart() |
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|
314 |
|
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|
315 |
def _get_media(self): |
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|
316 |
# All the forms on a FormSet are the same, so you only need to |
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|
317 |
# interrogate the first form for media. |
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|
318 |
if self.forms: |
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|
319 |
return self.forms[0].media |
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|
320 |
else: |
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|
321 |
return Media() |
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|
322 |
media = property(_get_media) |
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|
323 |
|
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|
324 |
def as_table(self): |
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|
325 |
"Returns this formset rendered as HTML <tr>s -- excluding the <table></table>." |
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|
326 |
# XXX: there is no semantic division between forms here, there |
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|
327 |
# probably should be. It might make sense to render each form as a |
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|
328 |
# table row with each field as a td. |
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|
329 |
forms = u' '.join([form.as_table() for form in self.forms]) |
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|
330 |
return mark_safe(u'\n'.join([unicode(self.management_form), forms])) |
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|
331 |
|
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|
332 |
def formset_factory(form, formset=BaseFormSet, extra=1, can_order=False, |
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|
333 |
can_delete=False, max_num=None): |
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changeset
|
334 |
"""Return a FormSet for the given form class.""" |
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|
335 |
attrs = {'form': form, 'extra': extra, |
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|
336 |
'can_order': can_order, 'can_delete': can_delete, |
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|
337 |
'max_num': max_num} |
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|
338 |
return type(form.__name__ + 'FormSet', (formset,), attrs) |
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|
339 |
|
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|
340 |
def all_valid(formsets): |
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|
341 |
"""Returns true if every formset in formsets is valid.""" |
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|
342 |
valid = True |
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|
343 |
for formset in formsets: |
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|
344 |
if not formset.is_valid(): |
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|
345 |
valid = False |
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|
346 |
return valid |