* Move all associations related code from Serializer class to Associations module
* Introduce Reflection class hierarchy
* Introduce Association class
* Rid off Serializer#each_association
* Introduce Serializer#associations enumerator
per ActiveModel::Serialization#serializable_hash
96bb004fc6/activemodel/lib/active_model/serialization.rb
def serializable_hash(options = nil)
options ||= {}
Otherwise, passing in nil to `as_json` or `serializable_hash`
makes things blow up when passing nil into attributes
It's an upgrade based on the new Cache implementation #693.
It allows to use the Rails conventions to cache
specific attributes or associations.
It's based on the Cache Composition implementation.
It's a new implementation of cache based on ActiveSupport::Cache.
The implementation abstracts the cache in Adapter class on a
private method called cached_object, this method is intended
to be used on Adapters inside serializable_hash method in order
to cache each instance of the object that will be returned by
the serializer.
Some of its features are:
- A different syntax. (no longer need the cache_key method).
- An options argument that have the same arguments of ActiveSupport::Cache::Store, plus a key option that will be the prefix of the object cache on a pattern "#{key}-#{object.id}".
- It cache the objects individually and not the whole Serializer return, re-using it in different requests (as a show and a index method for example.)
When the requests asked for a nested attribute in the `include` and it's
missing or empty, don't break because the type of the object can't be
determined.
If the request is for a collection and none of the elements has the
attribute, it will not be added to the `linked` key, similar to what
happens with simple includes.
When linked resource had has_many links, all of them would use the
association from the first resource, causing all of the items to build
`links` with the same associations.
This fixes it by iterating over the serializers, not just the
attributes array.
If type is `author` but the association is called `writer`, the linked
resource key should be called `authors`, e.g
{
...
linked: {
authors: [{
...
}]
}
...
}
Currently, doing `include: author.bio` would work correctly, but not for
has_many associations such as `include: author.roles`. This fixes it.
The problem was basically that we were not handling arrays for has_many linked,
as happens for ArraySerializers.
