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What do you call a function that's pure, meaning the same input will always return the same output, but also has side effects? What type of under the seat bag is practical, and what should be stored in it for the flight? How do I encourage users to supply information that might not be available, if it is available?
Discouraged from giving A's, but students are doing excellent work, what can a professor do?
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The enormous success of DropBox clearly shows that there's a huge need for simple and fast file sharing.
The command bundle install will install all gems defined in the Gemfile if they haven't already been installed. Next, let's make sure that we have a working database connection, and the database, "sharebox," set up.
Now if you do, you'll probably need to change the database.yml file to match your system's MySQL connection settings. This command will install a handful of files, but it'll also ask you to perform three things manually. Before we move on, we need to quickly add a Home controller with an Index action for the root url. If you fill in the form and submit it to create a new user, you'll then see the following image, which means you have successfully created the user, and have logged in. The paths destroy_user_session_path, new_user_session_path and new_user_registration_path are the default paths provided by devise for Signing out, Signing in and Signing up, respectively. Now it's time to use those relationships in the controller for loading the relevant resources(assets) for each logged in user.
In the code above, we're making sure that the asset(s) requested is, in fact, owned or created by the current_user (logged-in user), since "current_user.assets" will give you assets which are "belonged to" the user.
Now that we have added the "uploaded_file" field in the table, we then need to add it in the model.
As you can see, we have updated the header to "Uploaded Files," and have added the link instead of User Id. With that in mind, let's quickly refactor this to have a nicer name for the actual file name.


This code should allow you to use something like "asset.file_name" to get the uploaded file's actual file name. One of our goals for this application is to secure the uploaded files from unauthorized access.
Let's change the Asset model to store the uploaded file in the "assets" folder rather than "system" folder.
The option :url is for the url you would see in the address bar to download the file, whereas the path is for the place to actually store the file on your machine. We are essentially instructing Paperclip to store the uploaded files in the "assets" folder, under the Rails root folder. This means, when the url is accessed, it should route to the get action at assets_controller. The above method for letting the users download files will most likely be fine for an application with a small number of users and traffic. Since our application is for storing files and sharing them, we shouldn't ignore the opportunity to use Amazon S3. Storing files on your local machine (or your server) will limit the application, when it comes to data storage. Next, let's change the Asset model for the paperclip configuration to instruct it to store the files in S3. First and perhaps most important is that this cross-framework mating was not to be– at least with the current set of requirements ongoing. The model already exists on the Rails side, but the imported content obviously needed to match up with the existing schema. Then we need to run the following command in the Rails "sharebox" directory using Terminal.
You need to restart the Rails server (by pressing Ctrl+C and running 'Rails server') to reload all the new installed files from devise. The next step is for tidying up the layout and look and feel of the pages along with the links. However, since the word "File" is one of the Reserved Words, we'll just use the term "Asset" for the files.
But as you can see, the link is quite open to the public, and you can download it even after logging out. But once you get more and more requests (for download), the Rails app will suffer from using the default send_file method, since the Rails process will read through the entire file, copying the contents of the file to the output stream as it goes. Let's make this app use S3 to store the files to prevent some headaches which might come up later. Instead, why not use the brilliant gem, called aws-s3 to help Paperclip use Amazon S3 to store the files.


I erred on the side of leaving as small a foot print as possible and deleting the rake task when I completed my goal.
Also, copy and pasting rather than posting a screenshot ensures that your error message is text that is searchable. Instead of a screen-cap, could you please paste the entire stack-trace formatted around code-tags?
Paperclip also saves the file name in the name of the field we defined ("uploaded_file" in our case) plus "_file_name". Even after you've logged in, if you attempt to download a file which is not yours, you'll receive an error for now. Then, we will use the API to retrieve the shopping cart contents and display them on a WordPress site. Depending on what your needs are, you might find that creating the API is what interests you or that you are actually just interested in the part about calling an external API from WordPress.
Install Grape and Create an APINow, with the Rails project in place, ita€™s time to start creating the API.To build our API, we will use a tool calledGrape. These methods can be for example helpers needed to verify API parameters or methods for contacting the parent Rails application.resourcedefines a logical collection of API methods. While it isn't mandatory to declare parameters, it's good practice as it makes your code more readable and also saves you time as Grape will do most of the parameter validation for you.
For required parameters, you can use a similar construct, replacing optional with requires. This way, you can move the shopping cart around and place it in any sidebar area on your WordPress site. This way, whenever an application makes a request to the API, it needs to send its API key for the server to check. This one goes in thehelpersblock of your API class:def is_valid_api_key?(key)key == 'API_KEY'endThis is a simple version with just one API key, so depending on your application you might have to extend it. For example, if you have multiple applications calling the API, you will need to define a unique API key for each of them and store them in the database. Everything looks gooda€”actually, the same as before requiring the API keya€”and you have connected the Rails application with your WordPress site.5. To do this, let's create a new PHP function,get_shopping_cart, and call it right at the beginning of the WordPress site's execution.This can be done using WordPress action hooks.



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