You can create a [json-schema][1] and use the option:

    additionalProperties = false

That way you only allow the attributes defined in properties. In your case:

    {
    	&quot;properties&quot;: {
    		&quot;fname&quot;: {&quot;type&quot;: &quot;string&quot;},
    		&quot;lname&quot;: {&quot;type&quot;: &quot;string&quot;},
    		&quot;age&quot;: {&quot;type&quot;: &quot;string&quot;}
    	},
    	&quot;additionalProperties&quot;: false
    }

  [1]: http://json-schema.org/

I&#39;m banging my head against the wall with the following code in Swift. I&#39;ve defined a simple protocol:

    protocol Nameable {
        var name : String { get set }
    }

and implemented that with:

    class NameableImpl : Nameable {
        var name : String = &quot;&quot;
    }

and then I have the following method in another file (don&#39;t ask me why):

    func nameNameable( nameable: Nameable, name: String ) {
        nameable.name = name
    }

The problem is that the compiler gives the following error for the property assignment in this method:

&gt; **cannot assign to &#39;name&#39; in &#39;nameable&#39;**

I can&#39;t see what I&#39;m doing wrong... The following code compiles fine:

    var nameable : Nameable = NameableImpl()
    nameable.name = &quot;John&quot;

I&#39;m sure it&#39;s something simple I&#39;ve overlooked - what am I doing wrong?



Cannot assign to property in protocol - Swift compiler error

The structure of the project is:

 - Parent project
     - A project (Spring) have dependency of project B in pom.xml
     - B project (Spring MVC) have dependency of project A in pom.xml

After launching project B in Tomcat 7, I have an error:

&gt; Error:java: Annotation processing is not supported for module cycles.
&gt; Please ensure that all modules from cycle [A,B] are excluded from
&gt; annotation processing

How do I avoid this problem?

I use Java 8, Tomcat 7 and Intellij Idea 14.







How to configure annotations processing in IntelliJ IDEA 14 for current project work?

Suppose that I have schema like

    fname: string
    lname: string
    age: string

None of them are required. User can send me any of those attributes above but nothing else that is not declared. They can pass me `fname`, `lname` and `age` or all. But if they pass me all and additional property like `middle_name` the message should be rejected.

How would I define a schema like this?

Json Schema validation: do not allow fields other than those declared in schema

Suppose that I have schema like
<pre><code class="hljs language-vbnet">fname: string
lname: string
age: string
</code></pre>
None of them are required. User can send me any of those attributes above but nothing else that is not declared. They can pass me <code>fname</code>, <code>lname</code> and <code>age</code> or all. But if they pass me all and additional property like <code>middle_name</code> the message should be rejected.
How would I define a schema like this?

In my Unix shell script, when I execute a curl command, the result will be displayed as below which I am redirecting to file:

    {&quot;type&quot;:&quot;Show&quot;,&quot;id&quot;:&quot;123&quot;,&quot;title&quot;:&quot;name&quot;,&quot;description&quot;:&quot;Funny&quot;,&quot;channelTitle&quot;:&quot;ifood.tv&quot;,&quot;lastUpdateTimestamp&quot;:&quot;2014-04-20T20:34:59&quot;,&quot;numOfVideos&quot;:&quot;15&quot;}


But, I want this output to put in the readable JSON format like below in the file:

    {&quot;type&quot;:&quot;Show&quot;,
    &quot;id&quot;:&quot;123&quot;,
    &quot;title&quot;:&quot;name&quot;,
    &quot;description&quot;:&quot;Funny&quot;,
    &quot;channelTitle&quot;:&quot;ifood.tv&quot;,
    &quot;lastUpdateTimestamp&quot;:&quot;2014-04-20T20:34:59&quot;,
    &quot;numOfVideos&quot;:&quot;15&quot;}

How do I format the output this way?



Display curl output in readable JSON format in Unix shell script

I have some problems with getting my object from a JSON string. 

I got the class `Product`

    public class Product {
        private String mBarcode;
        private String mName;
        private String mPrice;
        
        public Product(String barcode, String name, String price) {
            mBarcode = barcode;
            mName = name;
            mPrice = price;
        }

        public int getBarcode() {
            return Integer.parseInt(mBarcode);
        }

        public String getName() {
            return mName;
        }

        public double getPrice() {
            return Double.parseDouble(mPrice);
        }
    }    

From my server I get an `ArrayList&lt;Product&gt;` in JSON String representation. For example:

    [{&quot;mBarcode&quot;:&quot;123&quot;,&quot;mName&quot;:&quot;Apfel&quot;,&quot;mPrice&quot;:&quot;2.7&quot;},
    {&quot;mBarcode&quot;:&quot;456&quot;,&quot;mName&quot;:&quot;Pfirsich&quot;,&quot;mPrice&quot;:&quot;1.1111&quot;},
    {&quot;mBarcode&quot;:&quot;89325982&quot;,&quot;mName&quot;:&quot;Birne&quot;,&quot;mPrice&quot;:&quot;1.5555&quot;}] 

   
This String is generated like this:

    public static &lt;T&gt; String arrayToString(ArrayList&lt;T&gt; list) {
        Gson g = new Gson();
        return g.toJson(list);
    }
To get my Object back I use this function:

    public static &lt;T&gt; ArrayList&lt;T&gt; stringToArray(String s) {
        Gson g = new Gson();
        Type listType = new TypeToken&lt;ArrayList&lt;T&gt;&gt;(){}.getType();
        ArrayList&lt;T&gt; list = g.fromJson(s, listType);
        return list;
    }

But when calling 

    String name = Util.stringToArray(message).get(i).getName();
I get the error 
*com.google.gson.internal.LinkedTreeMap cannot be cast to object.Product*

What am I doing wrong? It looks like it created a List of LinkedTreeMaps but how do i convert those into my Product Object?

com.google.gson.internal.LinkedTreeMap cannot be cast to my class

How I can get the number of elements in node of JSON data? 

**JSON:**

	{
	  &quot;result&quot;:[
		{
		  &quot;run&quot;:[
			{
			  &quot;action&quot;:&quot;stop&quot;
			},
			{
			  &quot;action&quot;:&quot;start&quot;
			},
			{
			  &quot;action&quot;:&quot;start&quot;
			}
		  ],
		  &quot;find&quot;:true
		}
	  ]
	}

I need to get the number of elements from node `data[&#39;result&#39;][0][&#39;run&#39;]`. It should be 3, but I can&#39;t find how to do it in Python.

How to count items in JSON data

I&#39;m importing some JSON files into my Parse.com project, and I keep getting the error &quot;invalid key:value pair&quot;.

It states that there is an unexpected &quot;8&quot;.

Here&#39;s an example of my JSON:

    }
     &quot;Manufacturer&quot;:&quot;Manufacturer&quot;,
     &quot;Model&quot;:&quot;THIS IS A STRING&quot;,
     &quot;Description&quot;:&quot;&quot;,
     &quot;ItemNumber&quot;:&quot;Number12345&quot;,
     &quot;UPC&quot;:083456789012,
     &quot;Cost&quot;:&quot;$0.00&quot;,
     &quot;DealerPrice&quot;:&quot; $0.00 &quot;,
     &quot;MSRP&quot;:&quot; $0.00 &quot;,
    }

If I update the JSON by either removing the `0` from `&quot;UPC&quot;:083456789012,` or converting it to `&quot;UPC&quot;:&quot;083456789012&quot;,` it becomes valid.

Can JSON really not accept an integer that begins with `0`, or is there a way around the problem?

Why is JSON invalid if an integer begins with a leading zero?

With **django-rest-framework 3.0** and having these simple models:

    class Book(models.Model):
        title = models.CharField(max_length=50)
    
    
    class Page(models.Model):
        book = models.ForeignKey(Books, related_name=&#39;related_book&#39;)
        text = models.CharField(max_length=500)

And given this JSON request:

    {
       &quot;book_id&quot;:1,
       &quot;pages&quot;:[
          {
             &quot;page_id&quot;:2,
             &quot;text&quot;:&quot;loremipsum&quot;
          },
          {
             &quot;page_id&quot;:4,
             &quot;text&quot;:&quot;loremipsum&quot;
          }
       ]
    }

How can I write a nested serializer to process this JSON and for each `page` for the given `book` either create a new page or update if it exists.

    class RequestSerializer(serializers.Serializer):
        book_id = serializers.IntegerField()
        page = PageSerializer(many=True)
    

    class PageSerializer(serializers.ModelSerializer):
        class Meta:
            model = Page

I know that instantiating the serializer with an `instance` will update the current one but how should I use it inside the `create` method of nested serializer? 

django-rest-framework 3.0 create or update in nested serializer

I have a `Card` component and a `CardGroup` component, and I&#39;d like to throw an error when `CardGroup` has children that aren&#39;t `Card` components. Is this possible, or am I trying to solve the wrong problem?

only allow children of a specific type in a react component

I wanted to understand the meaning of novalidate directive usage in form tag, especially when used to validate the form.

Thanks


What is the usage of Angular directive novalidate in a form html tag

**Situation**

While working with validation in the Django REST Framework&#39;s `ModelSerializer`, I have noticed that the `Meta.model` fields are always validated, even when it does not necessarily make sense to do so. Take the following example for a `User` model&#39;s serialization:

 1. I have an endpoint that creates a user. As such, there is a `password` field and a `confirm_password` field. If the two fields do not match, the user cannot be created. Likewise, if the requested `username` already exists, the user cannot be created.
 2. The user POSTs improper values for each of the fields mentioned above
 2. An implementation of `validate` has been made in the serializer (see below), catching the non-matching `password` and `confirm_password` fields

Implementation of `validate`:

    def validate(self, data):
        if data[&#39;password&#39;] != data.pop(&#39;confirm_password&#39;):
            raise serializers.ValidationError(&quot;Passwords do not match&quot;)
        return data

**Problem**

Even when the `ValidationError` is raised by `validate`, the `ModelSerializer` still queries the database to check to see if the `username` is already in use. This is evident in the error-list that gets returned from the endpoint; both the model and non-field errors are present.

Consequently, I would like to know how to prevent model validation until after non-field validation has finished, saving me a call to my database.

**Attempt at solution**

I have been trying to go through the DRF&#39;s source to figure out where this is happening, but I have been unsuccessful in locating what I need to override in order to get this to work.

Order of Serializer Validation in Django REST Framework

I have two fields:

QQ

Email

How do I set up a Validator object so that one of these fields must be filled? It doesn&#39;t matter which.

-------------------------------

```php
$messages = array(
    &#39;email.required_without:qq&#39; =&gt; Lang::get(&#39;messages.mustenteremail&#39;),
    &#39;email.email&#39; =&gt; Lang::get(&#39;messages.emailinvalid&#39;),
    &#39;qq.required_without:email&#39; =&gt; Lang::get(&#39;messages.mustenterqq&#39;),
);
```

Laravel Validation one of two fields must be filled

I&#39;m new to [Facebook Open Graph Protocol][1]. I have been trying to figure out what the meaning of the HTML `prefix` attribute is. The closest post on Stack Overflow I could find dealing with this subject is [this post][2] which was very helpful as it deals with what the differences are among the various possible syntaxes and which one to use.

However the post does not say anything about what this `prefix` attribute is or what it does. AFAIK this is not a standard HTML attribute. I was able to find [this document][3] which I think is where the W3C defines this attribute but was not able to make any sense of it.

Could someone please explain to me:

  1. What does the `prefix` attribute do?

  2. Can I write

    `&lt;html prefix=&quot;og:http://ogp.me/ns#&quot;&gt;`

  instead of

    `&lt;html prefix=&quot;og: http://ogp.me/ns#&quot;&gt;`

  or would that be a syntax error?

  3. Can I include multiple `prefix` attributes for any given HTML tag?

    `&lt;head prefix=&quot;a: http://www.aaa.com/ns#&quot; prefix=&quot;b: http://www.bbb.com/ns#&quot;&gt;`

    Based on my knowledge of HTML, this would be wrong, but then `prefix` is a nonstandard attribute. So perhaps, what I would like to know is, can I write:

    `&lt;head prefix=&quot;a: http://www.aaa.com/ns# b: http://www.bbb.com/ns#&quot;&gt;`

    or does specifying multiple prefixes at any place in the HTML tree not make sense for some reason?

  4. If this `prefix` tag is not part of the HTML spec, how would submitting a page containing this attribute to a code validator ever result in my code being standards compliant?

Thank you for answering my questions.

  [1]: http://ogp.me/
  [2]: https://stackoverflow.com/questions/8235687/open-graph-namespace-declaration-html-with-xmlns-or-head-prefix
  [3]: http://www.w3.org/TR/rdfa-syntax/#scoping-of-prefix-mappings

Meaning of HTML prefix attribute (Open Graph Protocol)?

# The `required` field in JSON Schema

JSON Schema features the `properties`, `required` and `additionalProperties` fields. For example,

    {
        &quot;type&quot;: &quot;object&quot;,
        &quot;properties&quot;: {
            &quot;elephant&quot;: {&quot;type&quot;: &quot;string&quot;},
            &quot;giraffe&quot;: {&quot;type&quot;: &quot;string&quot;},
            &quot;polarBear&quot;: {&quot;type&quot;: &quot;string&quot;}
        },
        &quot;required&quot;: [
            &quot;elephant&quot;,
            &quot;giraffe&quot;,
            &quot;polarBear&quot;
        ],
        &quot;additionalProperties&quot;: false
    }

Will validate JSON objects like:

    {
        &quot;elephant&quot;: &quot;Johnny&quot;,
        &quot;giraffe&quot;: &quot;Jimmy&quot;,
        &quot;polarBear&quot;: &quot;George&quot;
    }

But will fail if the list of properties is not *exactly* `elephant, giraffe, polarBear`.

# The problem
I often copy-paste the list of `properties` to the list of `required`, and suffer from annoying bugs when the lists don&#39;t match due to typos and other silly errors.

**Is there a shorter way to denote that all properties are required, without explicitly naming them?**

JSON Schema - require all properties

I want to describe with JSON schema array, which should consist of zero or more predefined values. To make it simple, let&#39;s have these possible values: `one`, `two` and `three`. 

Correct arrays (should pass validation):

    []
    [&quot;one&quot;, &quot;one&quot;]
    [&quot;one&quot;, &quot;three&quot;]

Incorrect:

    [&quot;four&quot;]

Now, I know the `&quot;enum&quot;` property should be used, but I can&#39;t find relevant information where to put it.

Option A (under `&quot;items&quot;`):
    
    {
        &quot;type&quot;: &quot;array&quot;,
        &quot;items&quot;: {
            &quot;type&quot;: &quot;string&quot;,
            &quot;enum&quot;: [&quot;one&quot;, &quot;two&quot;, &quot;three&quot;]
        }
    }

Option B:

    {
        &quot;type&quot;: &quot;array&quot;,
        &quot;items&quot;: {
            &quot;type&quot;: &quot;string&quot;
        },
        &quot;enum&quot;: [&quot;one&quot;, &quot;two&quot;, &quot;three&quot;]
    }

Correct way to define array of enums in JSON schema

I would like to know if I can define a JSON schema (draft 4) that requires at least one of many properties possible for an object. I already know of `allOf`, `anyOf` and `oneOf` but just can&#39;t figure out how to use them in the way I want.

Here are some example JSON to illustrate :

    // Test Data 1 - Should pass
    {
        
        &quot;email&quot;: &quot;hello@example.com&quot;,
        &quot;name&quot;: &quot;John Doe&quot;
    }
    // Test Data 2 - Should pass
    {
        &quot;id&quot;: 1,
        &quot;name&quot;: &quot;Jane Doe&quot;
    }
    // Test Data 3 - Should pass
    {
        &quot;id&quot;: 1,
        &quot;email&quot;: &quot;hello@example.com&quot;,
        &quot;name&quot;: &quot;John Smith&quot;
    }
    // Test Data 4 - Should fail, invalid email
    {
        &quot;id&quot;: 1,
        &quot;email&quot;: &quot;thisIsNotAnEmail&quot;,
        &quot;name&quot;: &quot;John Smith&quot;
    }

    // Test Data 5 - Should fail, missing one of required properties
    {
        &quot;name&quot;: &quot;John Doe&quot;
    }

I would like to require at least `id` or `email` (also accepting both of them) and still pass validation according to format. Using `oneOf` fails validation if I provide both (test 3), `anyOf` passes validation even if one of them is not valid (test 4)

Here is my schema :

    {
        &quot;$schema&quot;: &quot;http://json-schema.org/draft-04/schema#&quot;,
        &quot;id&quot;: &quot;https://example.com&quot;,
        &quot;properties&quot;: {
            &quot;name&quot;: {
                &quot;type&quot;: &quot;string&quot;
            }
        },
        &quot;anyOf&quot;: [
            {
                &quot;properties&quot;: {
                    &quot;email&quot;: {
                        &quot;type&quot;: &quot;string&quot;,
                        &quot;format&quot;: &quot;email&quot;
                    }
                }
            },
            {
                &quot;properties&quot;: {
                    &quot;id&quot;: {
                        &quot;type&quot;: &quot;integer&quot;
                    }
                }
            }
        ]
    }

Can you help me how to achieve correct validation for my use case ?

How to define a JSON schema that requires at least one of many properties

I want to have a JSON Schema with unknown property names in an array of objects. 
A good example is the meta-data of a web page: 

          &quot;meta&quot;: {
            &quot;type&quot;: &quot;array&quot;,
            &quot;items&quot;: {
              &quot;type&quot;: &quot;object&quot;,
              &quot;properties&quot;: {
                &quot;unknown-attribute-1&quot;: {
                  &quot;type&quot;: &quot;string&quot;
                },
                &quot;unknown-attribute-2&quot;: {
                  &quot;type&quot;: &quot;string&quot;
                },
                ...
              }
            }
          }
Any ideas please, or other way to reach the same?

JSON Schema with unknown property names

I&#39;ve seen this [other question](https://stackoverflow.com/q/10809459/940217) but it&#39;s not quite the same, and I feel like my issue is simpler, but just isn&#39;t working.

My data would look like this:

    [
        { &quot;loc&quot;: &quot;a value 1&quot;, &quot;toll&quot; : null, &quot;message&quot; : &quot;message is sometimes null&quot;},
        { &quot;loc&quot;: &quot;a value 2&quot;, &quot;toll&quot; : &quot;toll is sometimes null&quot;, &quot;message&quot; : null}
    ]

I&#39;m wanting to use [AJV](https://github.com/epoberezkin/ajv) for JSON validation in a Node.js project and I&#39;ve tried several schemas to try to describe my data, but I always get this as the error:


    [ { keyword: &#39;type&#39;,
        dataPath: &#39;&#39;,
        schemaPath: &#39;#/type&#39;,
        params: { type: &#39;array&#39; },
        message: &#39;should be array&#39; } ]


The schema I&#39;ve tried looks like this:

    {
      &quot;type&quot;: &quot;array&quot;,
      &quot;items&quot;: {
        &quot;type&quot;: &quot;object&quot;,
        &quot;properties&quot;: {
          &quot;loc&quot;: {
            &quot;type&quot;: &quot;string&quot;
          },
          &quot;toll&quot;: {
            &quot;type&quot;: &quot;string&quot;
          },
          &quot;message&quot;: {
            &quot;type&quot;: &quot;string&quot;
          }
        },
        &quot;required&quot;: [
          &quot;loc&quot;
        ]
      }
    }


I&#39;ve also tried to generate the schema using [this online tool](http://jsonschema.net/#/) but that also doesn&#39;t work, and to verify that that should output the correct result, I&#39;ve tried validating that output against [jsonschemavalidator.net](http://www.jsonschemavalidator.net/), but that also gives me a similar error:

    Found 1 error(s)
     Message:
     Invalid type. Expected Array but got Object.
     Schema path:
     #/type

Content Type	Original Author	Original Content on Stackoverflow
Question	Tuan Anh Tran	View Question on Stackoverflow
Solution 1 - Json	jruizaranguren	View Answer on Stackoverflow

Json Schema validation: do not allow fields other than those declared in schema

Json Problem Overview

Json Solutions

Solution 1 - Json

How to configure annotations processing in IntelliJ IDEA 14 for current project work?

Cannot assign to property in protocol - Swift compiler error

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