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from wtforms import Form
from wtforms.fields import StringField
from wtforms_test import FormTestCase
from tests import MultiDict
from wtforms_components import read_only
class TestReadOnlyFunction(FormTestCase):
def test_prevents_value_changing(self):
class MyForm(Form):
name = StringField(default="")
form = MyForm()
read_only(form.name)
form.process(MultiDict({"name": "New value"}))
assert form.name.data == ""
def test_preserves_previous_value(self):
class MyForm(Form):
name = StringField()
form = MyForm()
form.name.data = "Previous value"
read_only(form.name)
form.process(MultiDict({"name": "New value"}))
assert form.name.data == "Previous value"
def test_prevents_value_population(self):
class MyForm(Form):
name = StringField()
class MyModel:
pass
form = MyForm()
model = MyModel()
form.name.data = "Existing value"
read_only(form.name)
form.populate_obj(model)
assert not hasattr(model, "name")
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