![]() # Deserializes a string from the database to an attribute value. # Serializes an attribute value to a string that will be stored in the database. Serialize the preferences attribute using a custom coder class Rot13JSON Serialize the preferences Hash using YAML class User < ActiveRecord::Base Serialize the preferences attribute using JSON class User < ActiveRecord::Base Note that the class must have a default, empty constructor that takes no parameters because the serializer uses it to deserialize objects. Otherwise, the default will be nil.Įxamples Serialize the preferences attribute using YAML class User < ActiveRecord::Base First create the class that you want to serialize and decorate it with the Serializable attribute. If this option is not passed, the previous default value (if any) will be used. From Longman Dictionary of Contemporary Englishserializeserialize (also serialise British English) /srilaz sr-/ verb transitive SERIESto print. :default - The default value to use when no value is provided. The dump method may return nil to serialize the value as NULL. 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. Data serialization is the process of converting complex data structures, such as objects or dictionaries, into a format that can be stored or transmitted. 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. May be one of the following:ĭefault - The attribute value will be serialized as YAML. ParametersĪttr_name - The name of the attribute to serialize.Ĭlass_name_or_coder - Optional. ![]() 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. ![]()
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