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Overriding Models

Ron Ratovsky edited this page · 15 revisions

Swagger uses reflection to understand the models that are required as either input parameters or model attributes. For instance, a User object might have an Address attribute. Swagger will attempt to introspect the entire object hierarchy so that all aspects of the model can be provided to the consumer.

You can control what the Swagger introspection code sees with Swagger's own ApiProperty, using JAXB, or even @JsonIgnore annotations. When you use 3rd party or even generic Java objects, this can get tricky as you may not want all aspects of the model being represented in the Swagger JSON. For example, take java.util.Date.

By default, the Date object will be introspected from public methods, and look something like this:

"Date" : {
  "id" : "Date",
  "properties" : {
    "time" : {
      "type" : "long"
    },
    "minutes" : {
      "type" : "int"
    },
    "seconds" : {
      "type" : "int"
    },
    "hours" : {
      "type" : "int"
    },
    "month" : {
      "type" : "int"
    },
    "year": {
      "type" : "int"
    },
    "timezoneOffset" : {
      "type" : "int"
    },
    "day" : {
      "type" : "int"
    },
    "date" : {
      "type" : "int"
    }
  }
}

Now you probably don't want the client to build its own Date object from this description. If you, for instance, have configured your API to send the date in ISO-8601 format, the consumer probably wants to know that the date is coming as a string format. Thus, you really want your Date to serialize like such:

"Date": {
  "id": "Date",
  "properties": {
    "value": {
      "required": true,
      "description": "Date in ISO-8601 format",
      "notes": "Add any notes you like here",
      "type": "string"
    }
  }
}

This can be done by telling the model introspector to avoid reflecting over java.util.Date and instead to use a prescribed model representation:

In scala, with swagger-core version 1.3.x:

import com.wordnik.swagger.converter.{ ModelConverters, OverrideConverter }

val jsonString = """
{
  "id": "Date",
  "properties": {
    "value": {
      "required": true,
      "description": "Date in ISO-8601 format",
      "notes": "Add any notes you like here",
      "type": "string",
      "format": "date-time"
    }
  }
}
"""
val converter = new OverrideConverter
converter.add("java.util.Date", jsonString)

ModelConverters.addConverter(converter, true)

This needs to be fired on startup of the app, typically in a bootstrap servlet. Now whenever a java.util.Date is encountered by Swagger, it will use this definition.

In java, with swagger-core version 1.3.x:

import com.wordnik.swagger.converter.*;

String jsonString = "{" +
"  \"id\": \"Date\"," +
"  \"properties\": {" +
"    \"value\": {" +
"      \"required\": true," +
"      \"description\": \"Date in ISO-8601 format\"," +
"      \"notes\": \"Add any notes you like here\"," +
"      \"type\": \"string\"," +
"      \"format\": \"date-time\"" +
"    }" +
"  }" +
"}";
OverrideConverter converter = new OverrideConverter();
converter.add("java.util.Date", jsonString);

ModelConverters.addConverter(converter, true);

You may also find this discussion and example helpful when implementing this in Java: https://github.com/swagger-api/swagger-core/issues/359

Excluding fields with a Custom Model Converter (1.3.1 and greater)

If you want to exclude certain field types from your models, you can do so with a custom model converter. For example, perhaps you have a model with a property type EntityBeanIntercept from your model but you don't want to override the entire model--you can do so as follows:

class CustomConverter extends SwaggerSchemaConverter {
  override def skippedClasses: Set[String] = Set("com.avaje.ebean.bean.EntityBeanIntercept")
}

The fully-qualified types listed in the skippedClasses will neither be shown for the model, nor expanded into the model schema. See the unit test below, which excludes the property bar of type Bar from the model Foo:

class CustomConverterTest extends FlatSpec with ShouldMatchers {
  it should "ignore properties with type Bar" in {
    // add the custom converter
    ModelConverters.addConverter(new CustomConverter, true)

    // make sure the field bar: converter.Bar is not present
    ModelConverters.read(classOf[Foo]) match {
      case Some(model) => model.properties.get("bar") should be (None)
      case _ => fail("didn't read anything")
    }
  }
}

class Foo {
  @BeanProperty var bar:Bar = null
  @BeanProperty var title:String = null
}

class Bar {
  @BeanProperty var foo:String = null
}
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