Hey guys,
I had recently a very weird experience. I have a Loader class that run's a
lot of different things on Active Record objects. One thing this loader
does, is to preload data based on each classes settings. so basically:
scope.preload(preloads)
scope has a collection of Active Record objects.
preloads has an array with hashes inside that show what information to
preload for each relation.
Preloads use to be a function inside the loader class that calculated that
array, but it needed some information of the class itself, so I refactored
it out into another class.
This is an example how the code works, the implementation is not very
important and I simplified it for the sake of the example:
Class Incident
def preloads
# calculate preloads
end
def load
Loader.new(preloads)
end
end
Class Loader < Struct.new(:preloads)
def initialize(opts = {})
self.preloads = opts[:preloads] || []
end
def load
scope.preload(preloads)
end
end
So before the preloads when inside of the loader class return something
like(Every key is a symbol):
[{:updated_by_user=>[]}, {:service=>[{:account=>:additional_fields},
{:service_customers=>{:customer=>[]}}]}, {:owner=>[]},
{:closed_by_user=>[]}, {:assigned_user=>[]},
{:beetil=>{:satisfaction_ratings=>[]}},
{:beetil=>{:additional_values=>:additional_field}},
{:beetil=>{:additional_values=>:additional_field}}, :priority, :priority,
:service_activity_type, {:beetil=>{:customer_beetils=>{:customer=>[]}}},
{:beetil=>:audit_trail_groups}, {:beetil=>:latest_audit_trail_group},
:incident_status, :received_by_user, {}, {}]
And when passed as an argument is transformed into(Every key is a string):
[{"updated_by_user"=>[]}, {"service"=>[{"account"=>:additional_fields},
{"service_customers"=>{"customer"=>[]}}]}, {"owner"=>[]},
{"closed_by_user"=>[]}, {"assigned_user"=>[]},
{"beetil"=>{"satisfaction_ratings"=>[]}},
{"beetil"=>{"additional_values"=>:additional_field}},
{"beetil"=>{"additional_values"=>:additional_field}}, :priority, :priority,
:service_activity_type, {"beetil"=>{"customer_beetils"=>{"customer"=>[]}}},
{"beetil"=>:audit_trail_groups}, {"beetil"=>:latest_audit_trail_group},
:incident_status, :received_by_user, {}, {}]
But the problem is then I get an error of the load function saying:
TypeError: Cannot visit String
After I googled a little bit and debugged I realized that it worked with
the keys as symbols and not as strings.
How weird is that? so load only accepts keys with symbols and not strings?
is this a rails bug? am I approaching this wrong?
Any input would be appreciated.
all the best,
Andre
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