Most validators anything that subclasses formencode. FancyValidator will take a certain standard set of constructor keyword arguments. See formencode. Another notable validator is formencode.
Schemas are one example; in this case All takes a list of validators and applies each of them in turn. Any is its compliment, that uses the first passing validator in its list. Since a formencode. Schema is just another kind of validator, you can nest these indefinitely, validating dictionaries of dictionaries.
Another way to do simple validation of a complete form is with formencode. This class wraps a simple function that you write.
For example:. When it returns None this indicates that everything is valid. If you validate a partial form you should be careful that you handle missing keys and other possibly-invalid values gracefully. You can also validate lists of items using formencode. Each title has an associated book ID, so we can match up the new title and the book it is for:. It applies the BookSchema to each entry, and collects any errors and reraises them.
We gave a brief introduction to creating a validator earlier UniqueUsername and SecurePassword. With all validators, any arguments you pass to the constructor will be used to set instance variables. This makes it easy to also subclass other validators, giving different default values. The use of self. The keyword arguments to message are used for message substitution. See Messages for more. Validators use instance variables to store their customization information. You can use either subclassing or normal instantiation to set these.
These are effectively equivalent:. When dealing with nested validators this class syntax is often easier to work with, and better displays the structure. There are several options that most validators support including your own validators, if you subclass from formencode. FancyValidator :. All the validators receive a magic, somewhat meaningless state argument which defaults to None. For instance, imagine a validator that checks that a user is permitted access to some resource.
How will the validator know which user is logged in? Imagine you are localizing it, how will the validator know the locale? Whatever else you need to pass in, just put it in the state object as an attribute, then look for that attribute in your validator. Also, during compound validation a formencode. Schema or formencode. Tests that the given fields match, i. Takes two inputs a dictionary with keys static and upload and converts them into one value on the Python side a dictionary with filename and content keys.
The upload takes priority over the static value. Handles uploads of both text and cgi. FieldStorage upload values. This is basically for use when you have an upload field, and you want to keep the upload around even if the rest of the form submission fails. Note that big file uploads mean big hidden fields, and lots of bytes passed back and forth in the case of an error. The important method is. It gets passed a dictionary of the processed values from the form.
If you have. If not, then it should be a dictionary of fieldName: errorMessage. Invalid if the value is longer than maxLength. Uses len , so it can work for strings, lists, or anything with length. Invalid if the value is shorter than minlength. Test that the field contains only letters, numbers, underscore, and the hyphen. Subclasses Regex. Note that. If you provide a missing value a string key name then if that field is missing the field must be entered.
If you provide a present value another string key name then if that field is present, the required field must also be present. For example:. Encodes a string into a signed string, and base64 encodes both the signature string and a random nonce.
Also takes a max and min argument, and the string length must fall in that range. Also you may give an encoding argument, which will encode any unicode that is found. The first item of those lists is considered the preferred form.
The field value and a new copy of the dictionary with that field removed are returned. In addition to the String arguments, an encoding argument is also accepted. By default the encoding will be utf You can overwrite this using the encoding parameter.
You can also set inputEncoding and outputEncoding differently. If you want to allow addresses without a TLD e. If that function raises an exception, the value is considered invalid. Whatever value the function returns is considered the converted value. Unlike validators, the state argument is not used. Functions like int can be used here, that take a single argument. In this case, the if the email is not valid 'unknown localhost' will be used instead. The order of evaluation differs depending on if you are validating to python or from python as follows:.
All validators must work, and the results are passed in turn through all validators for conversion in the order of evaluation. All is the same as Pipe but operates in the reverse order. Will take a list of values and try to convert each of them to an integer, and then check if each integer is 1, 2, or 3.
Using multiple arguments is equivalent to:. This will turn non-lists into one-element lists, and None into the empty list. ForEach will try to convert the entire list, even if errors are encountered. Parser for HTML forms, that fills in defaults and errors. See render. Render the form which should be a string given the defaults and errors.
Defaults are the values that go in the input fields overwriting any values that are there and errors are displayed inline in the form and also effect input classes. Returns the rendered string. This can be used to support pre-filling of checkboxes that do not have a value attribute, since browsers typically will only send the name of the checkbox in the form submission if the checkbox is checked, so simply the presence of the key would mean the box should be checked.
Schema and pass the newly created Schema as the validators argument instead of passing a dictionary. Note that Schema validation is rigorous by default, in particular, you must declare every field you are going to pass into your controller or you will get validation errors.
To avoid this, add:. You can always use e. Moreover, you still have the problem of propagating the errors back to your users. Navigation index modules next previous TurboGears 2. Int , "b" : validators. See the FormEncode documentation for how this is done. You can use these like so: from formencode. NotEmpty , validators. UnicodeString ,. Create a schema: class PwdSchema schema.
FieldsMatch 'pwd1' , 'pwd2' ].
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