Trivial IRBRC

.irbrc

if Object.const_defined?("Rails")

  def r(model)
    model.connection;
    model.columns.map {|col|
      [col.name, col.type]
    }.to_h
  end

  def rp(model, filter = nil)
    pp case filter
    when nil
      r(model)
    when Symbol
      r(model).select {|_, type| type == filter }
    else
      r(model).select {|col, _| col =~ filter }
    end
    nil
  end

  puts <<~NFO
    Rails Shortcuts: r(model), rp(model, filter?)
  NFO

end

def i(obj)
  pp obj; nil
end

def m(obj, pattern = nil)
  methods = obj.methods.sort
  (pattern ? methods.grep(pattern) : methods) - Object.methods
end

def im(obj, pattern = nil)
  i(m(obj, pattern))
end

puts <<~NFO
  Shortcuts: i(obj), m(obj, pattern?), im(obj, pattern?)
NFO