Method: Sequel::Plugins::JsonSerializer::InstanceMethods#to_json

Defined in:
lib/sequel/plugins/json_serializer.rb

#to_json(*a) ⇒ Object

Return a string in JSON format. Accepts the following options:

:except

Symbol or Array of Symbols of columns not to include in the JSON output.

:include

Symbol, Array of Symbols, or a Hash with Symbol keys and Hash values specifying associations or other non-column attributes to include in the JSON output. Using a nested hash, you can pass options to associations to affect the JSON used for associated objects.

:only

Symbol or Array of Symbols of columns to only include in the JSON output, ignoring all other columns.

:root

Qualify the JSON with the name of the object. If a string is given, use the string as the key, otherwise use an underscored version of the model’s name.



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# File 'lib/sequel/plugins/json_serializer.rb', line 310

def to_json(*a)
  opts = model.json_serializer_opts
  opts = opts.merge(@json_serializer_opts) if @json_serializer_opts
  if (arg_opts = a.first).is_a?(Hash)
    opts = opts.merge(arg_opts)
    a = []
  end

  vals = values
  cols = if only = opts[:only]
    Array(only)
  else
    vals.keys - Array(opts[:except])
  end

  h = {}

  cols.each{|c| h[c.to_s] = get_column_value(c)}
  if inc = opts[:include]
    if inc.is_a?(Hash)
      inc.each do |k, v|
        if k.is_a?(Sequel::SQL::AliasedExpression)
          key_name = k.alias.to_s
          k = k.expression
        else
          key_name = k.to_s
        end

        v = v.empty? ? [] : [v]
        h[key_name] = JsonSerializer.object_to_json_data(public_send(k), *v)
      end
    else
      Array(inc).each do |c|
        if c.is_a?(Sequel::SQL::AliasedExpression)
          key_name = c.alias.to_s
          c = c.expression
        else
          key_name = c.to_s
        end

        h[key_name] = JsonSerializer.object_to_json_data(public_send(c))
      end
    end
  end

  if root = opts[:root]
    unless root.is_a?(String)
      root = model.send(:underscore, model.send(:demodulize, model.to_s))
    end
    h = {root => h}
  end

  h = yield h if defined?(yield)
  Sequel.object_to_json(h, *a)
end