code: async function findmodel (ctx, next) {
  	let pmodel = ctx.request.url.split('?')[0].split('/')[1];
  	ctx.model = ctx.db[pmodel];
  	ctx.state.model = ctx.state.db[pmodel];
  	await next();
  }
docs: Reads the model that is requested based on the route
  and appends model to ctx.state
  @param {KoaContext} ctx
  @param {KoaNext} next
  @param {JSURL} ctx.model - reference attached. DEPRECATED.
  @param {JSURL} ctx.state.model - reference attached.