Class: Squeel::Adapters::ActiveRecord::Context
- Inherits:
-
Context
- Object
- Context
- Squeel::Adapters::ActiveRecord::Context
show all
- Defined in:
- lib/squeel/adapters/active_record/context.rb,
lib/squeel/adapters/active_record/3.0/context.rb
Instance Attribute Summary
Attributes inherited from Context
#arel_visitor, #base, #engine
Instance Method Summary
collapse
Methods inherited from Context
#contextualize
Constructor Details
#initialize(object) ⇒ Context
Returns a new instance of Context.
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# File 'lib/squeel/adapters/active_record/context.rb', line 8
def initialize(object)
super
@base = object.join_base
@engine = @base.arel_engine
@arel_visitor = get_arel_visitor
@default_table = Arel::Table.new(@base.table_name, :as => @base.aliased_table_name, :engine => @engine)
end
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Instance Method Details
#classify(object) ⇒ Object
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# File 'lib/squeel/adapters/active_record/context.rb', line 47
def classify(object)
if Class === object
object
elsif object.respond_to? :base_klass
object.base_klass
else
raise ArgumentError, "#{object} can't be converted to a class"
end
end
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#find(object, parent = @base) ⇒ Object
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# File 'lib/squeel/adapters/active_record/context.rb', line 16
def find(object, parent = @base)
if JoinPart === parent
case object
when String, Symbol, Nodes::Stub
assoc_name = object.to_s
@object.join_associations.detect { |j|
j.reflection.name.to_s == assoc_name && j.parent == parent
}
when Nodes::Join
@object.join_associations.detect { |j|
j.reflection.name == object.name && j.parent == parent &&
(object.polymorphic? ? j.reflection.klass == object._klass : true)
}
else
@object.join_associations.detect { |j|
j.reflection == object && j.parent == parent
}
end
end
end
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#get_arel_visitor ⇒ Object
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# File 'lib/squeel/adapters/active_record/context.rb', line 71
def get_arel_visitor
@engine.connection.visitor
end
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#get_table(object) ⇒ Object
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# File 'lib/squeel/adapters/active_record/context.rb', line 59
def get_table(object)
if [Symbol, String, Nodes::Stub].include?(object.class)
Arel::Table.new(object.to_s, :engine => @engine)
elsif Nodes::Join === object
object._klass ? object._klass.arel_table : Arel::Table.new(object._name, :engine => @engine)
elsif object.respond_to?(:aliased_table_name)
Arel::Table.new(object.table_name, :as => object.aliased_table_name, :engine => @engine)
else
raise ArgumentError, "Unable to get table for #{object}"
end
end
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#traverse(keypath, parent = @base, include_endpoint = false) ⇒ Object
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# File 'lib/squeel/adapters/active_record/context.rb', line 37
def traverse(keypath, parent = @base, include_endpoint = false)
parent = @base if keypath.absolute?
keypath.path_without_endpoint.each do |key|
parent = find(key, parent) || key
end
parent = find(keypath.endpoint, parent) if include_endpoint
parent
end
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