Databases
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    <p>The best description of what the controller is:</p> <p><a href="http://edgeguides.rubyonrails.org/action_controller_overview.html" rel="nofollow">http://edgeguides.rubyonrails.org/action_controller_overview.html</a></p> <p><a href="http://edgeguides.rubyonrails.org/routing.html" rel="nofollow">http://edgeguides.rubyonrails.org/routing.html</a></p> <p>The controller doesn't communicate with the Database. The controller talks to the model, which then communicate with the database.</p> <p>When I was starting I found very useful to use scaffolding and just looking at what was created.</p> <p>Do this:</p> <pre><code>rails generate scaffold Post name:string title:string content:text </code></pre> <p>Examine all files under the app/ folder. Examine the file config/routes</p> <p>Then comment here your specific questions.</p>
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    1. POGive a detailed illustration of how the MVC works in Rails, and how the controller communicates with forms etc?
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    1. USNerian
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      1. VTUpMod
    1. CONerian, thanks for those links. I have read them all...many times. I understand the function of routes and I understand what the controller does. I have also looked through the scaffold and it did give me some insight into the way it functions - e.g. it automatically generates 6 actions, and in each action it shows me how to do what that action does e.g. index: `@users = User.all`, etc. However, my main issue is how to get it to do what I want. Do you mind just using the bank transaction example to explain it ? Thanks.
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      1. USmarcamillion
    2. COAs in...just to be clear: I understand why the scaffold generated what it did to do what the Rails Core team wants the scaffold to do. However, I don't understand (in intimate details) how to get the controller to do what I need it to do. If I want to show the customer their account balance, how would I do that and why would I do that? Would I use variables in the controller? What would I have in the view? Etc. I hope I am explaining it clearly.
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    3. CO@marcamillion: Sure. Take a look a the Index action. You will se that it makes a call Post.all – That query the database, through the Post model – and store the result in a @variable. Every variable that you define as @ will be passed to the view. In the view you will have a mix of HTML and Ruby code. Ruby code is between <% %> and <%= > . The difference is that <%= %> will output the result. For example <%= Product.name %> output the name. <% Product.name %> will not. Take a look a the Index view. Ask me anything you don't understand.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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