* Add params to set_id block arguments
Pull request #331 added a block to the ObjectSerializer.set_id class
method, which allows passing a block to the set_id method. Currently
this block takes only one argument `record`:
```
set_id do |record|
"#{record.name.downcase}-#{record.id}"
end
```
This PR adds another argument `params` to the block:
```
set id do |record, params|
params[:admin] ? record.id : "#{record.name.downcase}-#{record.id}"
end
```
This customization can be useful in situation where we serve different
clients that may need different IDs. One nice side effect is also that
the `set_id` method has the same method signature as the `attribute`
method.
* Update the README
Allow an ID of object to be customized directly on the serializer by
passing a block to `set_id` as opposed to only through a model property.
We already allow for attributes that do not have a model property of the
same name to be customized directly on the serializer using a block.
This customization can be useful in situation in which you have
different classes being serialized using the same serializer. For
example, if we have `HorrorMovie`, `ComedyMovie` and `DramaMovie` using
the same `MovieSerializer`, we can unify their IDs using
```
class MovieSerializer
include FastJsonapi::ObjectSerializer
attributes :name, :year
set_id do |record|
"#{record.name.downcase}-#{record.id}"
end
```
which is preferable to creating a `#serialized_id` method in every model
that will use `MovieSerializer` to encapsulate the customization.
Closes#315
* Add object_serializer_class_methods_examples
* Change to require spec/shared/examples in every spec files
* Refactor object_serializer_class_methods_spec
