New PDF release: An introduction to HDLs for simulation and synthesis (VHDL)

By Pellerin D.

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Describe "#publish" do # ... publish) end end end # ... Listing 54: Specifying publishing guards class Post # ... def publish(clock=DateTime) return false unless valid? add_entry(self) end # ... end Listing 55: Implementing publishing guards With these changes in place, we can update the PostsController to handle validation failures: 63 ADDING VALIDATION 64 # ... " else render "new" end end # ... Listing 56: Making the PostsController validation-aware With that change and some tweaks to the view (not shown), we now get an error message when we try to submit a blog post with no title.

We also need to implement one method ourselves: #persisted?. For now, it’s sufficient to just return false. class Post extend ActiveModel::Naming include ActiveModel::Conversion # ... def persisted? false end # ... end Listing 28: Augmenting Post with ActiveModel modules With that change, we can click on our “New post. . ” link and see a new post form. The Post creation action So far so good. Now let’s make submitting the form work. We need to add a PostsController#create action. 40 SUBMITTING POSTS 41 Figure 3: New post form class PostsController # ...

Stubbing out modules What we really need is a way to conditionally create empty or “stub” modules only if a) they are not already defined; and b) they are not autoloadable. Here’s a method which does just that. new) end end end Listing 36: stub_module This method uses #const_get to attempt to reference the given module. If the module is defined, or if calling #const_get causes it to be auto-loaded, the method does nothing more. But if #const_get fails to turn up the module, it defines an anonymous empty module to act as a placeholder.

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An introduction to HDLs for simulation and synthesis (VHDL) by Pellerin D.


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