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In the last video we started creating our new instance of a survey but we took a pause when we got to

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the creation of the sub document collection of recipients.

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So that's a reminder again and know we just looked at this but I want to make sure that it's really

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clear inside of our survey schema we said that there is a recipient's property that is an array of recipients

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schema objects.

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So if we then go and look at the recipient schema we had said that there is an e-mail property and they

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responded property and that we didn't actually have to define the respondent property because it will

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be defaulted defaults which is exactly what we want inside of our application.

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So if we start to visualize the actual relationship here the actual kind of structure of the survey

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and the recipient.

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We might end up with something that looks like this.

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So this is essentially what we want to do when we create a survey instance we want to pass in an object

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that has the title the subject the body and then for the recipient's property it's where each object

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has an email property that points out the string email for that particular recipient.

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When we pass in this array of objects mongoose will automatically create that sub document collection

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for us.

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So all we really have to do is make sure that we pass in an array of objects that contains the user's

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email address as a key of email.

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So we need to somehow get from this recipient's argument or this recipient parameter or property that's

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passed along with the request body which is a comma separated string of e-mail addresses and transform

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it into an array of objects where each object has an email property of the individual e-mail address.

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So that's essentially why I want to take the pause and say hey just to make sure we're on the same page.

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This is a little bit complicated.

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It is complicated because we have to do that transformation from the array of strings to the array of

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objects.

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So let's talk about how we're going to pull this off step by step.

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It's actually not going to be that bad.

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So we're going to do is we're going to take that list or string of email addresses that are separated

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by commas.

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We will call the Split function on that string which will take that string up here.

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It will split the entire string by every comma inside of it and return an array of strings.

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So it would then be at this step right here where we have an array of strings.

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Each string is one individual e-mail address.

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We can then use the map function.

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And if you're not familiar with map that's fine we'll walk through it exactly how it works.

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And for every element inside of this array of strings or for every string inside of that array will

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return an object with a property of email that contains the user's actual e-mail an e-mail address or

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the actual string that was in that previous array.

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So let's give this give this a shot.

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The actual code that we're going to write here is going to be very concise very concise but there's

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going to be a lot of stuff going on on a single line.

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So after our body property we're going to pass in the recipient's property and this is going to be our

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array of objects containing the e-mail addresses so we will first start off by taking the recipient's.

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We're going to split by Komba.

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So this right here is going to turn the thing into an array of strings or an array of email addresses.

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And then for every string in that array we will map over it the map function right here takes every

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single email in the array.

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It runs some function on that individual element and then it creates a new array of what we return from

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the arrow function or the function that we passed to map right here.

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So we will say for every email address in there return a new object that has an email of email like

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so so this returns our array of strings and then we say for every email address returning object.

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So here's the object with a property email that points out the user's e-mail.

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Now it can use a little bit of ESX code to dramatically simplify this arrow function right here.

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First off you'll notice that we've got an identical key and value so we can condense it to be just email

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like so and then notice how the body of the arrow function consists of one javascript expression.

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We just create the object and return it.

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So rather than putting in the outside curly braces and the return keyword because we have just one javascript

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expression inside of your we can remove the return keyword and the outside curly braces like so.

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So now we've got opening curly brace closing clearly Bretts.

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Now this will create an object with a key of e-mail and the value of whatever that e-mail address was.

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The last thing you have to do to make sure that works correctly when javascript sees this line of code

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right here when it sees the curly braces.

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It will get a little bit confuse because it will not understand if we are defining a function body or

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if we are defining a kind of shortened object right here and we are actually defining a shortened object.

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So to make sure that that is really clear to the javascript interpreter we're going to wrap it with

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a set of parentheses like so.

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So now we've got opening opening closing closing and closing like so.

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OK.

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So again this will take the list of email addresses.

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Split it into an array and then return an object for every e-mail address in there with a property of

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email and the value of the actual email address.

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So that's pretty much it for creating the survey as far as these very simple straightforward properties

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go right here.

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Now as you and I know there are several other properties that this survey expects to have.

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So we've just dealt with the floor up here so far.

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The next one that we're going to deal with is going to be the user property.

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We don't have to worry about the yes and no properties because again we've assigned default values to

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them.

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So we don't have to specifically say start out with zero yeses and zero NOS or anything like that.

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They will just be automatically defaulted for us.

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So the next property that we really have to worry about is the user relationship right here.

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Remember that underscore user is used to point at the user who owns this very particular survey.

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So when we create this new instance of a survey back inside of our survey route's file over here we

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need to make sure that we somehow link the current user to this survey that we are creating right here.

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So we're going to out on one more property I can to make sure that I put a comma at the line right above

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us and they will say underscore user because remember we are indicating that this is a relationship

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field by saying by putting the underscore in there and then all we have to do is pass in the current

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user's ID which is available as Reyk user ID.

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Now this id property right here is the id property that is automatically generated by mongoose in lango.

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So we don't have to generate this ourselves so we don't have to define it in the schema or anything

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like that.

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It is just a property that is available to us on any mongoose model.

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Now I think that the very last thing we have to put inside of your very last thing we have to make sure

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that we mark the date at which this survey was actually sent.

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So we have not yet actually sent the survey.

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But essentially you know when we create this instance right here we are close enough to the creation

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time.

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So I think that just right here we can immediately say hey here is the date at which the survey was

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sent.

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No we haven't not yet created the e-mail or any of that stuff like that but we can just kind of assume

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that we're close enough to it and say right now we have sent a survey.

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So we will out in the date sent property and we'll say that it's essentially right now and we can do

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that by saying date dot.

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Now like so.

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So this returns a date object which Mongo can handle.

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OK.

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And it just records when we have created and sent off the survey.

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OK.

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So we have now made our new survey.

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Remember this just makes an instance of a survey in memory and has not yet been persisted to our database

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or anything like that.

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So at this point we're now going to take a little bit of a break.

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When we come back we're going to look at a diagram that's going to help us understand exactly what we

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are doing with the survey model after we create it.

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And that's going to help us understand exactly how we send an e-mail off to all the people who are listed

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inside of the survey as well.

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So let's take a quick break.

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We'll come back in the next section and we'll start tackling.

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Email.