#100DaysOfCode in Python Transcripts
Chapter: Days 97-99: Building JSON APIs
Lecture: Ensuring starter data
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When you saw me get started with Flask here, and I created
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a main method, and the main method we call run.
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And then down here where if the,
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the main convention where I call main,
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you might have thought,
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"Well, why don't you just run down there?
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Come on.
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Like, what are you doing?"
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It turns out that in real web applications,
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there's tons of startup and configuration code.
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Configuring the logger, configuring the
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database connections, etc., etc.
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So I did this with that fact in mind.
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So one of the things that we're going to need to do is
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we actually need to make sure that the starter data that
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they application is going to use exists.
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All the rules have have been created in the database.
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There's always going to need to be a computer,
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sort of opponent user, like a built-in user.
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We are going to create that as just a standard user
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in the database with a special lookup and things like that.
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So let's go over here,
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and maybe we can make this more obvious.
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We can say...
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"Run web app,"
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and we can take this and put that down there.
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And up here, we'll say, "Run web app" as the last thing,
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but let's call another one, let's say, "Build starter data."
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And we'll define Builder Starter Data.
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Well, what goes in here?
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Well, we can go to our game decider.
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Go up here and say, "from game_logic import game_decider"
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We're also going to need GameService later
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in just a second.
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So we'll come down here and say,
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game_decider.all_rollnames."
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We can just print out roll names, just to see what's
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coming along really quick here.
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And let's just throw a quick return so the app
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doesn't actually start.
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Here you can see we are getting all the roll names.
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That's really cool.
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So it looks like that's working.
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And then the GameService,
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this is the thing that talks to the database.
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It has an init rolls, and if you give it the roll names,
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it will make sure that all these are created in the
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database, have ID's and things like that.
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If they're already existing,
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this is just going to bail out of that.
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The other thing has to do with that computer users.
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So let's come over here and say,
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Computer = GameService()
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Find player by computer."
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And if the computer already exists, that's great.
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But if it doesn't, we're going to create this one.
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We'll create the player called computer.
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Okay, so we want to make sure this happens
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every single time.
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Now, it's kind of silly because, really,
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it only has to happen once, and then the
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database is initialized.
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But have this here to make any changes,
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make any additions to, will be really, really nice.
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So, before we run our web app, we're going to make sure that
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the starter date, or like the rolls,
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and the computer player, and so on, are all there.
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Let's go ahead and run this and see how it works.
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Run it and nothing happens.
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Well, not nothing.
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It built the starter data and then I,
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sure, sure I could do this right here, right?
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So if we run it now, it should be running the web app.
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But let's look in here.
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Woo, look what we got over here.
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We have our Rock Paper Scissors SQLite database.
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Let's put over into here and see what we got.
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There are all the rolls.
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Created that time: rock, gun, lightning, devil, and so on.
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If we run it again and again, we're never going to have
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more than 15 rolls.
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The other thing that we might want to look at
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is from players.
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And now we just have our computer that we created, as well.
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So we have our starter data.
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Now our system is just going to check.
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Like this init_rolls, if we go to there, you'll see.
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It says, "Look, if we have some here, let's just get out."
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Right?
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Similarly, we check to see if the player already exists,
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and if they do, we're just not going to do anything.
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But if they don't exist, we're going to
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create them the one time.
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All right, so now we have our models imported.
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And remember, this is effectively just what we did
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in the previous demo. There's nothing changed here.
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We just dropped it in here and called a couple of functions
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in the beginning of our web app before we let it run every
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time it starts up, to make sure out database is all set up.
