So, in the previous lecture, we examined writing ad inventory function and we are trying to add a record in our dynamodb table. Now, we came across an error which is preventing our functionality to write into dynamodb. And because we don't have I am permission to write into this dynamodb table, you might say okay, they are in the same region. So why we are not at able to add anything, but understand that you have to have an IM permission roll defined. And it is just to how, you know communication happens within AWS itself. And if we quickly examine, we have an execution role add inventory role, we'll just go to Im role add inventory role and examine the role.

So, initially when we examine this role, we can see we have to just basic functionality to execute this lambda and locks which is cloud watch logs. So this can only run this function and can create locks under cloud watch locks. Now what we need to do is we need to add permissions so it can access our Dynamo DB inventory table and it should be able to write. So what we are going to do is we are going to choose a service in this case a dynamo DB service because we want to write into dynamodb for the sake of understanding we are not just worried about access level let's let's select all dynamodb table actions so we can write we can list we can delete we can update anything. And what we are going to also say is all resources are not limited to any industry. with Aaron or resources in this case, we'll have to give a policy name and be aware that this is an inline policy and not managed policy from AWS.

So once we have defined the name of our policy now that has been added, and if we see we have full permission to add, update, delete, or list any sort of information in our dynamodb table, in this case, add inventory, but we have access for everything in this case. Now what we are going to do, we are going to test again and you see, this time it is successful. So the record has been written successfully into our dynamodb table, we just go to table, refresh it a bit and say number three, Id It's been written into dynamodb Now, so, because since it was missing I am permission, we have to define that that that policy so, it can communicate, you can do so, now you can do all other operations manually with dynamodb. And this is pretty pretty good you know kind of hands on. Now, what we want to do here is then we want to get those values dynamically from a request body rather hard coded in this lambda function itself.

And if we see we have ID name is in stock all this attribute. So, what we have to do is, we just have to get all those informations dynamically as we saw in the last lecture that how to how event works and what what sort of information even content so, we are trying to extract those information request body in this case. And so we can extract those informations dynamically. Of course, we can also move table name as an environment variable. And let's set up an an environment variable to to get a dynamodb table name. And let's let's define in here.

And now as if you know no J's already how to access those environment variables just by process dot environment. ENB taught us your environment variable name. And that's how you access environment variable in node j s. And the same approach works with AWS lambda as well. So you we have defined environment variable now we have test we are not testing it. So now when we see this, we still have status code 201 and Once we refresh this dynamodb what what actually happens because, what what happens is if we if we go to our test data does ID one, so, it just replaced all those information I just configured a different ID. So, we can see dynamodb replaces, it finds the same ID or same same sock key in the request body itself.

Now, if we test it, it should be it is it is successful and if we press get a set, we will see this ID three is successfully in our dynamodb table itself. And this is quite good hands on in this course, we will learn how to configure environment variable, getting those values dynamically, and we have created a working lambda functions function which adds an inventory in the dynamodb table. That's okay for this lecture. I'll see you in the next lecture.