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module CustomAttributesFilter
def by_custom_attributes(items)
return items unless params[:custom_attributes].is_a?(Hash)
return items unless Ability.allowed?(current_user, :read_custom_attribute)
association = items.reflect_on_association(:custom_attributes)
attributes_table = association.klass.arel_table
attributable_table = items.model.arel_table
custom_attributes = association.klass.select('true').where(
attributes_table[association.foreign_key]
.eq(attributable_table[association.association_primary_key])
)
# perform a subquery for each attribute to be filtered
params[:custom_attributes].inject(items) do |scope, (key, value)|
scope.where('EXISTS (?)', custom_attributes.where(key: key, value: value))
end
end
end
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