Data seeder

application_helper.rb

# `name` is a symbol used as a key of the object described by `prefix`.
# `template` is the name of the partial (from view/ and without the _).
# `locals` are the local variables accessible in the template.
def seed_data(name, template, locals, prefix = 'window.Seeds')
  partial = { partial: template, locals: locals, handlers: [ :jbuilder ], formats: [ :json ] }
  json    = render(partial, locals)
  key     = "#{prefix}.#{name}"
  code    = "#{key} || (#{key} = {}); #{key} = #{json};"

  javascript_tag { raw(code) }
end