> On Jan 13, 2018, at 11:01 PM, Robert Phillips <robert.phillip...@gmail.com>
> wrote:
>
>
>
> On Sunday, 14 January 2018 00:46:39 UTC, Hassan Schroeder wrote:
> On Sat, Jan 13, 2018 at 4:18 PM, Robert Phillips
> <robert.p...@gmail.com> wrote:
>
> > So, what it is doing is rails is taking its own template then it dumps my
> > template into its <body></body>
>
> Yep, that's the way it works, though "template" is the wrong word.
>
> This: http://guides.rubyonrails.org/layouts_and_rendering.html
> may help.
>
> If you want something within the scope of a layout like a title to be
> dynamic you can assign the value in your controller and pass it in
> as a variable, e.g. <title>@title</title>
>
>
>
> Thanks, I can see what was happening now..
>
> Whatever view is displayed, if displays the html from here
>
> .\app\views\layouts\application.html.erb
>
> which specifies a title and some other tags.
>
> And that file says
>
> <body>
> <%= yield %>
> </body>
>
>
> And then so when trying to access '/', it went to some specified
> controller some action, e.g. blah#bleh, then it rendered the
> application.html.erb file, and inserted within it, the blah\bleh.html.erb
> file. A fix was to rename application.html.erb
>
> Why is template not an appropriate name.. Isn't any ERB file a template,
> since you can insert data into it?
>
> Also I notice that when I do root 'application#a' and I have in my
> application controller def a end, then I http to '/' then it runs the
> action but it can't find the template.. Is there anywhere that I can put
> a.html.erb that the rails server would find it? Or does the application
> controller not have a corresponding template for each action?
>
I think you may be getting hung up on the word template. Rails defines two
different terms for what I suspect you are thinking of here: template and
layout. A template is specific to a particular action in a particular
controller, for example /views/widgets/show.html.erb would be a template
automatically invoked for widgets_controller.rb's show method. A template only
contains the code necessary to render the "guts" of the page, it never includes
head or html elements or any of the repeated bits you may use to center the
page or set up a grid. Think of a template as containing only the answer to the
question: "What makes this page different than any other page in the site?"
A layout, on the other hand, is the outermost parts of the page only, with one
line in the middle that reads <%= yield %>. That line is replaced by everything
else that has been rendered so far. (Very often you will see that there is only
one of these layouts for an entire site.) This has a number of benefits for you
as a developer. For one thing, you don't have to repeat yourself in each
template by creating all the outer page code. For another, Rails can precompile
that code and have everything ready to go when the rest of the template
sandwich is prepared for a new request.
All of the HTML generated by Rails is created in inside-out order. For example,
partials are rendered for individual lines of a table, then the table is
rendered in a template, then the template is inserted into the body (the
layout) and the page is complete.
When you want to make parts of the layout dynamic, as you do, then the right
place to do that is with a helper method. Helpers can be called within the
template (where the variable data is known) and then cause an effect in the
final rendering through the content_for mechanism. Here's one that I use:
app/helpers/application_helper.rb
def title(content)
content_for :title, "#{content} | Site Name Here"
end
In the application.rb.html layout, I have a title tag, like this:
<title><%= content_for?(:title) ? yield(:title) : "Site Name Here" %></title>
This gives me a generic title if I haven't bothered to set it, but allows me to
pass in the title I want to show simply by setting the content_for :title key
as you saw in the helper.
Finally, in the show template for my widget page, I would add this line
anywhere in the code (order is not important, because it will always be
rendered before the layout is):
<%- title @widget.product_name %>
And that sets the title on the layout for me.
Now you could set this `content_for` value in the controller, too, but I do it
in the view because I usually add another layer to the helpers like this:
def headline(content)
title(content)
content_tag :h1, content
end
So in my template, where I want the H1 tag with the page headline on it, I
simply do this:
<%= headline @widget.product_name %>
And now I have a perfectly matched H1 and title, for optimal SEO performance. I
put the headline in the page where I want it to appear, and there's no
additional effort to make the title tag.
Walter
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