Created
November 23, 2011 16:25
-
-
Save rentalcustard/1389123 to your computer and use it in GitHub Desktop.
"model.show_on(view)" Not "view.show(model)"
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #What follows is an extremely contrived example of how this might | |
| # look. Please don't pay attention to the incredibly naive JSON | |
| # and HTML creation code, that's not supposed to be the point. | |
| class Account | |
| def show_on(view) | |
| view.show_balance(self.balance) | |
| view.show_holder(self.holder_name) | |
| view.show_creation_date(self.created_at) | |
| end | |
| end | |
| class JSONAccountView | |
| def initialize | |
| @result = "{" | |
| end | |
| def show_balance(balance) | |
| add_pair("balance", "£#{balance}") | |
| end | |
| def show_holder(holder) | |
| add_pair("holder_name", holder) | |
| end | |
| def show_creation_date(date) | |
| add_pair("created_on", date.to_s) | |
| end | |
| def finish(output) | |
| output << (@result + "}") | |
| end | |
| private | |
| def add_pair(label, value) | |
| @result << "," unless @result == "{" | |
| @result << "#{label}: #{value}" | |
| end | |
| end | |
| class HTMLAccountView | |
| def initialize | |
| @result = "<html>" #and some other boilerplate... | |
| end | |
| def show_balance(balance) | |
| add_pair("Balance", "£#{balance}") | |
| end | |
| def show_holder(holder) | |
| add_pair("Account holder", holder) | |
| end | |
| def show_creation_date(date) | |
| add_pair("Created at", date.format("some format string")) | |
| end | |
| def add_pair(label, value) | |
| @result << "<span class=\"label\">#{label}</span>" | |
| @result << '<span class="value">' | |
| @result << value | |
| @result << "</span>" | |
| end | |
| def finish(output) | |
| output << (@result + closing_boilerplate_here) | |
| end | |
| end | |
| class StreamingAccountView | |
| def initialize | |
| #set up stream | |
| end | |
| def show_balance(balance) | |
| stream.send("bal: #{balance}") | |
| end | |
| def show_holder(holder) | |
| stream.send("holder: #{holder}") | |
| end | |
| def show_creation_date(date) | |
| stream.send("created: #{date}") | |
| end | |
| def finish | |
| stream.close | |
| end | |
| end | |
| account = Account.last | |
| view = StreamingAccountView.new | |
| account.show_on(view) | |
| view.finish | |
| account = Account.last | |
| view = JSONAccountView.new #or HTML, same thing for our purposes | |
| account.show_on(view) | |
| view.finish(some_output) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment