Building data-driven web apps with Pyramid and SQLAlchemy Transcripts
Chapter: Introducing the Pyramid framework
Lecture: Building block: Configuration
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Configuration's a super important part of our web app.
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Like I described in the intro to this chapter
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there's certainly behaviors you would like
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to be different in development than in production.
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A real simple is, do you send email notifications to users
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when you take certain actions?
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Well, in production, of course you do that, right?
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I want to reset my password, or I purchased this thing.
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If you're doing testing locally, especially if somebody
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comes to you and says, hey, the site's not working for me,
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I tried this, but this happens, you might want
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to log in as that user and then try that action.
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And obviously you don't want them to get the email.
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The easiest way to do this in Pyramid is to have
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different configuration files, both for development,
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production, test, whatever the various scenarios you have are.
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In fact, when you create a new project,
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it comes with a development.ini and a production.ini,
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and in here we have a bunch of settings
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that Pyramid uses to control itself.
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But we can add other settings just by saying
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key equals value, so db_file=/db/webapp.sqlite,
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API key equals whatever that thing is.
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Notice there's no quotes on the strings,
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they just come back as strings anyway.
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Super easy, we can do that.
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Now how do you get to them in Pyramid?
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Well, we saw that main startup method,
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and the settings being passed in there,
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so that's super easy.
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We go to that again.
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Now we can go to that config and say get us the settings,
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this is a dictionary that has those keys and values.
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So if I want the DB file, I just say configsettings.get,
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and there's just standard Python dictionary access.
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Get me the thing for DB file, get me the API key,
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and off you go.
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And obviously these can be different
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in development and production.
