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So validation works and it didn't add our incorrect post,

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now let's play around with the additional settings we can set which I already showed on my slides. For

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the settings to activate,

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I would need to create my collection again and set up the validation again,

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the problem is I of course already have my validation turned on here,

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so what can I do? As a database administrator

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and this is how you would add such settings like validation,

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you can use db.runCommand in the shell here to run, well administrative command.

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You pass a document with information about the command

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and here, the command is that we set a collMod, that stands for collection modifier and we define the collection

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which we do want to modify, posts

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in my case and then we can again pass a validator.

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So now we can pass exactly what we pass to create collection, so we pass validator and then the entire

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schema below that,

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so make sure to grab that portion of the file, go back to the shell. Now important, remove the closing

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parentheses, add a comma and paste in what you just copied and then add another closing curly brace

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and a closing parentheses

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but we're not done here.

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If I hit enter like this of course,

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it works but now I just set the same validation again.

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What I instead want to do is I want to change my validation settings, so I'll add a new file

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which you also find attached to this video then in the finished form where I copy my create collection code

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into.

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Now here, we will have run command as you just saw, then we pass our opening curly brace,

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collMod then holds the name of the collection we want to edit and then I need to remove that curly

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brace here, can reformat.

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This is now the command

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and now here I got my validator

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but now, I also want to switch an additional setting.

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Now let's search for the closing parentheses of validator because we need to set our validator configuration

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as a sibling to that validator

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key here.

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So for my ID, it comes in and highlights this, after this we can add validation level to control whether

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all inserts and updates are checked or only updates to elements which were valid before

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but I want to set a validation action here.

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The default is error which blocks the action and throws an error,

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I'll set it to warn. Let's copy that entire code,

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again you'll find it attached to this lecture and execute it here, should be successful.

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And now if I again tried to insert one post with my author being well or having a value of 12, which

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is not an objectId, this actually succeeds

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and the only thing it did is it will have written a warning into our log file and the log file is stored

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on our system,

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we'll have a look at this later lecture when we talk about configuring our server and so on.

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So this is the difference,

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now what you want to use here depends on your application and your requirements there.

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It's good to know that you can configure these things and putting validation in place can make a lot

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of sense depending on how your application works, how important it is for you to have one consistent

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scheme of data and you also now saw that you can define that validation schema when you create the

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collection or also thereafter with the help of run command.