We then launch a container running the official Postgres docker image , version alpine. To remove the container, given it was launched with the --rm option, we simply need to stop it and it will be removed automatically.
Alternatively, using another terminal we can stop the container with the command:. We can use the same docker container run Now that our Postgres server is up and running, we need to configure the Phoenix app to connect to the database.
Repo functions insert , get , …. If we then want to use this app in production — and we want to take advantage of cloud storage instead of refactoring it to use S3 which is obviously a great option! We could use the phx. However, I find the generated scaffold a bit too much for what we need. Instead, I like to use this generator to learn more about the phoenix patterns, observing how the components are supposed to be used together.
The only generator we are going to use here is to create the Ecto schema and migration. Once the user has uploaded a file, we want to save different information about it into our database. The first parameter Documents. Upload is the schema name, which creates a Poetic. Upload module, where Documents is our context we will see more about this later.
By default Ecto also creates the id column, which is the primary key. To save a value bigger than 2GB, we need a bigint — which is plenty of space to store the kind of file we need to handle in our app up to Petabytes! But they show, that there is almost no difference between our libraries.
The second and sometimes - the first parameter - security. There is great article about security , and no sense to say something more. For example. Why should I wrap Erlang library into Elixir library, when I can call it directly? As you see, MyModule is CamelCased word, that can be prefixed with MyNamespace also CammelCased , followed by function name with function arguments in brackets.
Erlang calls even have autocomplition in IEx , the same as Elixir functions. Conclusion : There is almost no difference between these calls, so the experience should be almost the same.
You can learn more about applications in Elixir's official docs for Application. Mailer module, which defines the main interface to deliver e-mails:.
It defines a Hello. Repo module which is our main interface to the database. If you are using Postgres the default database , you will see something like this:. And that's it for now. As you work on your project, we will add files and modules to this directory. It looks like this when expanded:.
All of the files which are currently in the controllers , templates , and views directories are there to create the "Welcome to Phoenix! By looking at templates and views directories, we can see Phoenix provides features for handling layouts and error pages out of the box. Response struct; I matched on that struct in order to get the body of the response.
Now the body variables contains the image data which is just a binary ; you can write it to a file:. Whoops, forgot to mention the httpc Erlang module included in the stdlib!
To stream the URL directly to a file with httpc :. I downloaded a MB file and the observer showed that memory use never exceeded 25MB. Note the single quoted strings! We cannot pass Elixir strings to this Erlang library.
I created download elixir package to bypass these cons. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Let's change.
This change will allow us to display the photos correctly. Definition macro. Okay, so now we can display our pictures, but we also need to make some changes when it comes to adding new images. Let's go to our form. We also need to change our form into a multipart form. Now let's check our changes and how what we've done works.
If we want to upload files to Amazon S3 we need to add some extra libraries from ExAws to what we already have:. After that, it's time to set up some configurations.
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