Title: Nested serialization with to_json and to_xml with array and
hash element
class Person < ActiveRecord::Base
has_one :address
has_one :job
def office()
return "Executive_Suite"
end
end
class Address < ActiveRecord::Base
belongs_to :person
end
class Job < ActiveRecord::Base
belongs_to :person
has_one :paygrade
def Title
return "Engineer"
end
end
class PayGrade < ActiveRecord::Base
belongs_to: job
end
Given an instance of a Person, I am able to serialize in XML and JSON
in some simpler nested manners such as this:
@person = Person.find_by_id(1)
# render the results with multiple peer associations with no drill
down
respond_to do |format|
format.json { render.json(:json=>@person.to_json(:include=>
[:address, :job], :methods=>:office) }
format.xml { render.json(:json=>@person.to_json(:include=>
[:address, :job], :methods=>:office) }
}
end
# render the results with 1 association requiring deep drill down
respond_to do |format|
format.json { render.json(:json=>@person.to_json(:include=>
{:job=>{:include=>:paygrade}}) }
format.xml { render.json(:json=>@person.to_json(:include=>{:job=>
{:include=>:paygrade}}) }
}
end
Where I continually run into problems is where I have multiple peer
associations at the same level
with one of them needing further drill down into one of its
association.
For instance I thought I could simply do this to serialize the Person
instance, along with their address, job with Paygrade.
Whenever I try to do this:
respond_to do |format|
format.json { render.json(:json=>@person.to_json(:include=>
[:address, {:job=>{:include=>:paygrade}}] }
format.xml { render.json(:json=>@person.to_json(:include=>
[:address, {:job=>{:include=>:paygrade}}] }
}
end
I always get the following error: You have a nil object when you
didn't expect it. Error evaluating nil.ma.
Based on my understanding the :include is expecting an array but I'm
adding a hash as an element and Rails
is not expecting it in the way I'm specifying?
Where I also continually run into problems is where I have multiple
peer associations at the same level
with one of them needing requiring a custom method to be serialized.
Question 1: What is the correct way to be able to specify that I need
to serialize the Person with address
and job along with the paygrade for the job? This is the multiple
peers with deep drill down problem mentioned above.
Question 2: What is the correct way to be able to specify that I need
to serialize the Person with address
and job along with the custom Job Title method with the paygrade?
When I try this, I get error:
respond_to do |format|
format.json { render.json(:json=>@person.to_json(:include=>
[:address, {:job=>{:methods=>:title, :include=>:paygrade}}] }
format.xml { render.json(:json=>@person.to_json(:include=>
[:address, {:job=>{:methods=>:title, :include=>:paygrade}}] }
}
end
Please advise, and thanks in advance.
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