Ruby JBuilder with variable names?

Question

How do I use a variable name when constructing a JSON using jBuilder in Ruby?

For example, suppose I have a variable var1:

var1 = "query_string"
query = Jbuilder.encode do |json|
          json.query do
            json.query_string do
              json.query "SOMETHING"
            end
          end
        end

How can I do something like:

json.var1 do

Rather than explicitly: json.query_string?

Answer 1

In order to send a message whose name is not statically known, you can use the Object#public_send method:

var1 = 'query_string'

query = Jbuilder.encode do |json|
  json.query do
    json.public_send(var1) do
      json.query "SOMETHING"
    end
  end
end