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gabeodess/custom_arel.rb

Last active September 20, 2020 23:16
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An example of how to add a custom predicate to Arel
Raw
custom_arel.rb
module Arel::Predications
def has_key(right)
Arel::Nodes::HasKey.new(self, quoted_node(right))
end
end
class Arel::Nodes::HasKey < Arel::Nodes::Binary
def operator; :"?" end
end
class Arel::Visitors::PostgreSQL
private
def visit_Arel_Nodes_HasKey o, collector
infix_value o, collector, " #{Arel::Nodes::HasKey.new(nil, nil).operator} "
end
end
Raw
example.rb
Person.where(Person.arel_table[:address].has_key('borough')).to_sql
# "SELECT \"people\".* FROM \"people\" WHERE (\"people\".\"address\" ? 'borough')"
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