Be careful when writing Rails Projects

Be careful when writing Rails Projects

1. If the form contains data to be sent back to the server, you can use the hidden property control:

Form_for (xxx) do | f |

F. hidden_field: xxx, value: xxx

End

2. If you need some information in the global page framework, but the information belongs to some specific pages, you can use the following method:

<% Content_for: QuestionsCount do %>
<% = @ Question. length if @ question %>
<% = 0 unless @ question %>
<% End %>

Add the following code to pipeline. erb:

<Title> Exams (questions in the question bank <% = yield: QuestionsCount %>) </title>

3. in some redirection or render operations, we may not need to display the page to be redirected in the default page framework. We hope to use a special page framework; in this case, you can manually specify a page framework:

Respond_to do | format |
Format.html {render layout: "my_layout "}
End

4. in some cases, we hope that the email field in the mode can be null or be in a certain format. If validates_format_of is used for verification, we will find that verification fails if its value is null, in addition to the Verification Method with higher degrees of freedom, there is also a simple way to set the allow_blank parameter of validates_format_of to true:

Validates_format_of: email ,\
With:/\ A [^ @] [\ w. -] + @ [\ w. -] + [.] [a-z] {2, 4} \ z/I, allow_blank: true, message: "Incorrect email format"

Install Apache server in Ubuntu and use the Passenger plug-in to deploy Rails Applications

Build a Ruby On Rails platform using CentOS

Build Ruby On Rails in Ubuntu

Web development agile way application Rails agile Web development (original book version 4th). (US) Sam Ruby). [PDF] + source code

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