Tags for questions related to validating data.
1
vote
0answers
47 views
How to report multiple errors as a result of validation?
I have a class that transforms a complex model, for example an abstract syntax tree or intermediate model. The model can be either valid, invalid or partially invalid, i.e. it contains errors but some ...
1
vote
0answers
39 views
Is there any way to take advantage of portable ViewModels for ASP.Net?
Microsoft supports portability when taking advantage of the MVVM pattern: https://msdn.microsoft.com/en-us/library/hh563947(v=vs.110).aspx
This means that I can create a ViewModel that is reusable in ...
0
votes
2answers
80 views
How can I test code that verifies data sanity?
I have a large data structure that gets read in from XML. I've been given a large list of constraints that should hold between data members. For example, one of the constraints might look like
...
38
votes
8answers
3k views
Should I throw an exception in case of a meaningful value outside of the range or handle it myself?
I have written a struct that represents latitude/longitude coordinates. Their values range from -180 to 180 for longtitudes and 90 to -90 for lattitudes.
If a user of that struct gives me a value ...
0
votes
2answers
37 views
Handling delay in entry of OTP for log in validation
There's an application, which accepts a user id and password to login. Validation of the id and password is processed by another system. Now after password validation, the application generates a One ...
1
vote
3answers
145 views
How far should I validate user input in my own created API?
I got something here that bogs my mind a bit.
Let's say I write me this API (in TS), check out some of these properties:
export class MyAPI{
...
2
votes
2answers
130 views
Which layer should validation located?
I'm creating Rest API using (Spring Boot) and i using Hibernate Validation to validate request input.
But I also need other validation, example when update data need to check, if company id not ...
4
votes
1answer
80 views
Writing a valid Test Case for validating XMLs
How would I write a unit test, say JUnit, for validating an XML file?
I have an application that creates a document as an XML file. In order to validate this XML structure, do I need to create an XML ...
0
votes
0answers
30 views
Where should user input be validated? [duplicate]
I am working on a webbased user interface using AngularJS. As a database I am using MongoDB which can be accessed through an Python-eve-API.
The API is able to validate the passed data as stated in ...
23
votes
4answers
3k views
Is client-side validation really all that important, always? [duplicate]
Through the years I've worked in web development it's been ingrained in me that client-side validation is absolutely and completely necessary in all web applications. Seems to me like all the people ...
2
votes
2answers
82 views
How can a method handle validation and entity creation without output parameters?
I have 3 simple classes. A Reference, a Parent, and a Child. The Child knows the Reference and Parent instances it's associated with. Here they are, initialization and other data/methods omitted:
...
0
votes
0answers
24 views
Verify That Filters on a Dataset are Exclusive
Suppose I have a data table of, say, cars with a bunch of properties for each record. Example:
|Vin|Year|Make|Model|Color|Mileage|
I want to allow users to define (arbitrarily complex) filters which ...
3
votes
2answers
192 views
Should I add a layer to keep object always valid and immutable?
I am developing COM. A factory need to be initialized first by providing a ID. I can not pass arguments to IFactory instance via CoCreateInstance. So IFactory may need add a init method to be called ...
0
votes
1answer
40 views
Should formatter do validation?
Say I have a SSN field in a form. I want SSN to be in format of xxx-xx-xxx.
I may just have a SSN formatter checking whether the input are all digits and adding dashes when necessary.
Another ...
1
vote
0answers
78 views
ModelState Validation vs JQuery vs Remote
I was stuck with some validations for quite a while. I have been thoroughly searching the internet to find ways to apply the validations I require. I came across many methods for validations even ...
2
votes
2answers
245 views
Justifying programmatically ensuring frontend and backend validations are synchronised
Like many Javascript-based rich web apps these days, I have some complicated validation rules implemented on the front-end. The same rules are supposedly repeated exactly on the Java backend but I ...
3
votes
2answers
121 views
How do I prevent attackers from duplicating submissions?
I want to create a polling website. A client requests to answer the poll using POST, and the server responds with the candidates. The client then sends a POST with the candidate information and the ...
1
vote
0answers
71 views
What's the right way to approach validations? [closed]
I'm a rails developer, and have noticed that while defining validations I find myself confused about the scope I'm trying to cover.
For example, I have basic cases where a field of data (ex: name, ...
2
votes
2answers
108 views
Why use a unique hashkey for form submissions?
I have multiple forms and use AJAX to submit them. I asked my boss if he needed any specific format for the form ID and he told me to generate a unique hash and keep it in session; check it whenever ...
0
votes
1answer
55 views
How to work with fail reason [duplicate]
Imagine that I have a method like User::validate($data), and mostly the developer expects only that is returns a boolean (true mean "ok, validated with success"). But, in some specific cases, he need ...
5
votes
2answers
195 views
Where should business logic go in a layered architecture?
First of all, i'm not talking about validation in the sense of the nullability or length of a field like in this and this questions where we can use isValid() methods in business classes or an ...
1
vote
1answer
70 views
Loading Aggregate Root from Database with Validations
Here is a similar question
Where to validate domain model rules that depend on database content?
I am asking this new question because I have more descriptions and I don't want to change the ...
4
votes
3answers
737 views
Java & REST API: How do I check for duplicate before inserting record?
I am developing an application in Java to parse and upload records from a CSV to an online database, via a REST API.
While I know for sure that there are no duplicate records in each CSV file, I ...
1
vote
1answer
135 views
Rails validation: Which method is preferred
In Ruby on Rails there are two ways to validate, for instance, the presence of input fields. Say I want to make sure the user has filled out my fields called value and name. I could put in my model ...
2
votes
0answers
160 views
What's the best pattern to validate a conditional entity? [duplicate]
I'm developing an ASP.NET MVC 5 website and I have a view with a grid. In this grid I have a column which represents an URL property.
This url is a link to download some files, but this url should be ...
2
votes
4answers
82 views
If I have a method that needs verification in order to proceed, do I call it inside the method or before? [duplicate]
This has been bothering me. This is more of a pragmatic problem than technical. Imagine I have a SaveOrderChanges method which, as its name implies, will save the order changes when the user submits ...
1
vote
1answer
101 views
File validation rules
I have an application that can accept CSV files to run some operations. The files look like:
CREATE USER:username,last_name,first_name,age
user1,Smith,John,23
user2,Poppins,Mary,257
There are a ...
1
vote
2answers
148 views
When writing a library or an API, when should and when shouldn't I validate or automatically correct errors in data provided by another developer?
I have a fairly good understanding of when data validation should and shouldn't exist when it comes when writing an application that is only dealt with by an end-user, and all the different tiers of ...
4
votes
3answers
111 views
How do I model this relationship so that it is valid by construction?
Imagine a device class that represents a physical real world mobile device, with fields like Enabled, Platform, Model IMEI, etc. Then, an operation class, which is something that needs to be done to a ...
29
votes
7answers
4k views
Should I validate a method call's return value even if I know that the method can't return bad input?
I'm wondering if I should defend against a method call's return value by validating that they meet my expectations even if I know that the method I'm calling will meet such expectations.
GIVEN
User ...
1
vote
2answers
457 views
Pattern for validating rules having different signatures
I have a class in charge of responding to an input event and maybe triggering another event. To decide, it has several rules to check.
I'm trying to get away from a class looking like this:
public ...
2
votes
1answer
90 views
Use of validators for simple validations
I've been working in Liferay code, and I've come across this construct a few times:
List<?> list;
...
if (Validator.isNotNull(list)) {
//do stuff
}}
The source code for Validator.java ...
0
votes
1answer
239 views
Always set form input max length?
Background
I'm looking to put together a single page web application with many form inputs. I've run into issues with other web pages where there is an ugly SQL error sent to the user if the ...
7
votes
2answers
586 views
What is best practice to handle whitespaces when letting the user edit the configuration, the name=value pairs?
For instance, you let the user define the notorious path variable. How do you interpret apppath = C:\Program Files\App?
This looks like a programming language adopted practice to ignore the white ...
1
vote
0answers
108 views
How to consume inconsistent REST API with Mongo DB backend?
We are using a third party REST API and we are building one of the pages on our ASP.NET site around the data it delivers. We get results in JSON, and interact with it mostly using .NET MongoDB Driver.
...
1
vote
3answers
168 views
Coerce bad input or always crash early
The general consensus seems to favor the Crash Early approach, the most reputable source being the acclaimed Pragmatic Programmer book.
And while I understand and agree with the advice in many ...
1
vote
2answers
430 views
Why all consider UAT a validation activity? It contradicts the original idea
Virtually any book dealing with software testing mentions that user acceptance testing (UAT) is an ultimate validation activity, often quoting Boehms informal definition: "Validation: Are building the ...
3
votes
6answers
1k views
Domain Model, validation, and pushing errors to the model
Looking into DDD and something I noticed is that business logic should be in the model, otherwise you just have property bags. That said how do you handle pieces of validation that require a trip to ...
5
votes
8answers
442 views
Do objects with validation logic in their domain really represent their real world counterparts?
I asked a question about whether validation behavior should be treated the same as other types of behavior in regard to the concept of OOP being "data + behavior". I got some good answers back that ...
3
votes
3answers
792 views
OOP: Behavior + Data, but what about 'validation' behaviors?
EDIT: Thanks for all the great answers! In reading these responses I realized that I'm approaching this from the wrong angle so I wrote a new question here.
I had this discussion with my superior ...
3
votes
1answer
215 views
Difference between patterns: Specification, Guarding, Conditions, Monads, Validation,
I'm currently trying to get my head around a few patterns (especially the ones mentioned in the title above) that are made to address different problems and are being used in different parts of the ...
-1
votes
1answer
241 views
Is there a set of standards for data validation rules? [closed]
I'm trying to develop a generic data validation engine for web forms. Basically, the idea is to write a library that loads a JSON "validation schema", and then generates the appropriate server-side ...
3
votes
2answers
211 views
Should I throw guard exceptions that will be thrown by internal methods anyway? [duplicate]
I have some fairly simple code (C#):
/// <summary>
/// Truncates a string to a maximum length.
/// </summary>
/// <param name="value"> The string to truncate. ...
1
vote
2answers
248 views
Where should the “not empty field” validation code be written on a 3-layer application?
When working with the 3-layer model, where should the validation code be placed? for: not empty fields, unchecked options, null values, wrong-written dates, etc.
To keep total isolation between a ...
1
vote
2answers
129 views
Writing a simple code validator
I know that programming languages can be defined in EBNF which can be converted into regular expressions. Right now I am working on a very simple BASIC interpreter for a project. The code has to be ...
3
votes
2answers
598 views
Where to put format validation in a CQRS “stylish” domain model?
It feels right to put format validation inside the domain objects (VOs or entities) because it is the natural place for high cohesion and the domain knows best what every domain ...
1
vote
2answers
109 views
Property value validations on POCO entities
Sorry in advance if this question is so trivial.
The situation
There is a Customer entity whose ID is limited to two letters (A to Z) in the database.
Also, a user can enter the ID value from a ...
1
vote
1answer
831 views
Presenter accessing the value in text box using sender object
I have following method in my presenters which validates the user inputs on the UI. Basically to capture the value of the text property of the text box, it uses sender object which was passed in by ...
3
votes
4answers
120 views
Can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate?
There are many situations where the validity of the timestamp attached to a certain post (submission of information) might be invaluable for the post owner's legal usage. I'm not looking for a service ...
6
votes
4answers
2k views
Managing client-side and server-side validations in one place
I'm 100% on board with the case that one should definitely use both client-side and server-side data validations.
However, in the frameworks and environments I've worked in, the approaches I've seen ...
