make dsl more compatible

[pynixwang]

require "granite/adapter/mysql"

class Post < Granite::Base
  connection mysql
  table posts # this strange
  # table :posts also work
  # table "posts" also work

  column id : Int64, primary: true # Primary key, defaults to AUTO INCREMENT
  column name : String? # Nilable field
  column body : String # Not nil field
end

[Blacksmoke16]

What exactly are you proposing here?

[pynixwang]

table posts # this strange
 # table :posts also work
 # table "posts" also work

make macro args more compatible

[Blacksmoke16]

For anyone wanting to do this, https://github.com/amberframework/granite/blob/master/src/granite/table.cr#L54

Needs to be: @[Granite::Table(name: {{(name.is_a?(StringLiteral) ? name : name.id.stringify) || nil}})]

[pynixwang]

connection also