50 lines
1.8 KiB
Ruby
50 lines
1.8 KiB
Ruby
module Travis::API::V3
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module Extensions
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# This is a patch to ActiveRecord to allow classes for polymorphic relations to be nested in a module without the
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# module name being part of the type field.
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#
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# Example:
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#
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# # Without this patch
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# Repository.find(2).owner.class # => User
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# Travis::API::V3::Models::Repository.find(2).owner.class # => User
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#
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# # With this patch
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# Repository.find(2).owner.class # => User
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# Travis::API::V3::Models::Repository.find(2).owner.class # => Travis::API::V3::Models::User
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#
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# ActiveRecord does not support this out of the box. We accomplish this feature by tracking polymorphic relations
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# and then adding the namespace when calling ActiveRecord::Base#[] with the foreign type key and removing it again
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# in ActiveRecord::Base#[]=, so we don't break other code by accidentially writing the prefixed version to the
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# database.
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module BelongsTo
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module ClassMethods
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def polymorfic_foreign_types
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@polymorfic_foreign_types ||= []
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end
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def belongs_to(field, options = {})
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polymorfic_foreign_types << (options[:foreign_type] || "#{field}_type") if options[:polymorphic]
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super
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end
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end
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def self.included(base)
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base.extend(ClassMethods)
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super
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end
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def [](key)
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value = super
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value &&= "#{self.class.parent}::#{value}" if self.class.polymorfic_foreign_types.include?(key)
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value
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end
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def []=(key, value)
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value &&= value.sub("#{self.class.parent}::", ''.freeze) if self.class.polymorfic_foreign_types.include?(key)
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super(key, value)
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end
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end
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end
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end
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