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require 'active_support/per_thread_registry'
module ActiveRecord
module Scoping
extend ActiveSupport::Concern
included do
include Default
include Named
end
module ClassMethods
def current_scope #:nodoc:
ScopeRegistry.value_for(:current_scope, self)
end
def current_scope=(scope) #:nodoc:
ScopeRegistry.set_value_for(:current_scope, self, scope)
end
# Collects attributes from scopes that should be applied when creating
# an AR instance for the particular class this is called on.
def scope_attributes # :nodoc:
all.scope_for_create
end
# Are there attributes associated with this scope?
def scope_attributes? # :nodoc:
current_scope
end
end
def populate_with_current_scope_attributes # :nodoc:
return unless self.class.scope_attributes?
self.class.scope_attributes.each do |att,value|
send("#{att}=", value) if respond_to?("#{att}=")
end
end
def initialize_internals_callback # :nodoc:
super
populate_with_current_scope_attributes
end
# This class stores the +:current_scope+ and +:ignore_default_scope+ values
# for different classes. The registry is stored as a thread local, which is
# accessed through +ScopeRegistry.current+.
#
# This class allows you to store and get the scope values on different
# classes and different types of scopes. For example, if you are attempting
# to get the current_scope for the +Board+ model, then you would use the
# following code:
#
# registry = ActiveRecord::Scoping::ScopeRegistry
# registry.set_value_for(:current_scope, Board, some_new_scope)
#
# Now when you run:
#
# registry.value_for(:current_scope, Board)
#
# You will obtain whatever was defined in +some_new_scope+. The #value_for
# and #set_value_for methods are delegated to the current ScopeRegistry
# object, so the above example code can also be called as:
#
# ActiveRecord::Scoping::ScopeRegistry.set_value_for(:current_scope,
# Board, some_new_scope)
class ScopeRegistry # :nodoc:
extend ActiveSupport::PerThreadRegistry
VALID_SCOPE_TYPES = [:current_scope, :ignore_default_scope]
def initialize
@registry = Hash.new { |hash, key| hash[key] = {} }
end
# Obtains the value for a given +scope_type+ and +model+.
def value_for(scope_type, model)
raise_invalid_scope_type!(scope_type)
klass = model
base = model.base_class
while klass <= base
value = @registry[scope_type][klass.name]
return value if value
klass = klass.superclass
end
end
# Sets the +value+ for a given +scope_type+ and +model+.
def set_value_for(scope_type, model, value)
raise_invalid_scope_type!(scope_type)
@registry[scope_type][model.name] = value
end
private
def raise_invalid_scope_type!(scope_type)
if !VALID_SCOPE_TYPES.include?(scope_type)
raise ArgumentError, "Invalid scope type '#{scope_type}' sent to the registry. Scope types must be included in VALID_SCOPE_TYPES"
end
end
end
end
end
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