# Deserializes a string from the database to an attribute value. Unlike Jackson, you cannot serialize or deserialize arbitrary objects to JSON. # Serializes an attribute value to a string that will be stored in the database. Enables serialization/deserialization in Micronaut applications using. Serialize the preferences attribute using a custom coder class Rot13JSON Serialize the preferences Hash using YAML class User < ActiveRecord::Base After the transmission, the recipient has to deserialize the byte strings. Serialize the preferences attribute using JSON class User < ActiveRecord::Base Serialization converts complex objects into byte strings which can be transmitted. Otherwise, the default will be nil.Įxamples Serialize the preferences attribute using YAML class User < ActiveRecord::Base If this option is not passed, the previous default value (if any) will be used. :default - The default value to use when no value is provided. ksqlDB offers several mechanisms for controlling serialization and deserialization. The dump method may return nil to serialize the value as NULL. The term serialization format refers to the manner in which a records raw bytes are translated to and from information structures that ksqlDB can understand at runtime. The attribute value must respond to to_json.Ĭustom coder - The attribute value will be serialized using the coder's dump(value) method, and will be deserialized using the coder's load(string) method. JSON - The attribute value will be serialized as JSON.

Hash - The attribute value will be serialized as YAML, but an empty Hash will be serialized as NULL. The attribute value must respond to to_yaml.Īrray - The attribute value will be serialized as YAML, but an empty Array will be serialized as NULL. You specify this in the predicate node in the configuration file. This is different from the the default format that always uses one tree per database (master, web, core). May be one of the following:ĭefault - The attribute value will be serialized as YAML. When you use the YAML serialization format, you can use serialize as many item trees that you want. The replacer will work on functions though, so if you really want to, you could try converting the function to a string. The LatLng constructor will add the functions back in for you. ParametersĪttr_name - The name of the attribute to serialize.Ĭlass_name_or_coder - Optional. Stewart: The idea is that you avoid having to serialize the functions by re-constructing the objects when you deserialize them. There is no need to use serialize in this case.įor more complex cases, such as conversion to or from your application domain objects, consider using the ActiveRecord::Attributes API. For instance: json and jsonb types in PostgreSQL will be converted between JSON object/array syntax and Ruby Hash or Array objects transparently. Keep in mind that database adapters handle certain serialization tasks for you. The serialization format may be YAML, JSON, or any custom format using a custom coder class. If you have an attribute that needs to be saved to the database as a serialized object, and retrieved by deserializing into the same object, then specify the name of that attribute using this method and serialization will be handled automatically.