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module Arel
module Nodes
class TableAlias
attr_reader :name, :relation, :columns
alias :table_alias :name
def initialize name, relation
@name = name
@relation = relation
@columns = relation.columns.map { |column|
column.dup.tap { |col| col.relation = self }
}
end
def [] name
name = name.to_sym
columns.find { |column| column.name == name }
end
end
end
end
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