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 279

def to_json(*a)
  opts = model.json_serializer_opts
  opts = Hash[opts].merge!(@json_serializer_opts) if @json_serializer_opts
  if (arg_opts = a.first).is_a?(Hash)
    opts = Hash[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|
        v = v.empty? ? [] : [v]
        h[k.to_s] = case objs = send(k)
        when Array
          objs.map{|obj| Literal.new(Sequel.object_to_json(obj, *v))}
        else
          Literal.new(Sequel.object_to_json(objs, *v))
        end
      end
    else
      Array(inc).each{|c| h[c.to_s] = send(c)}
    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

  Sequel.object_to_json(h, *a)
end