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Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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What is the easiest way to duplicate an activerecord record?
...record record, changing a single field in the process (in addition to the id ). What is the simplest way to accomplish this?
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Git: How to update/checkout a single file from remote origin master?
... the deployed repository)
git fetch
git checkout origin/master -- path/to/file
The fetch will download all the recent changes, but it will not put it in your current checked out code (working area).
The checkout will update the working tree with the particular file from the downloaded changes (o...
Batch files: How to read a file?
How you can read a file (text or binary) from a batch file? There is a way to read it in a binary mode or text mode?
7 Answ...
How to set Default Controller in asp.net MVC 4 & MVC 5
...MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters*
new { controller = "Home", action = "Index",
id = UrlParameter.Optional }
);
as the default landing page. You can change that to be any route you wish.
routes.MapRoute(
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Shell script to send email [duplicate]
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$ echo "hello world" | mail -s "a subject" -a "attachment file" someone@somewhere.com for sending files
– Saurabh Saxena
Feb 18 '13 at 7:45
3
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How Do I Use Factory Girl To Generate A Paperclip Attachment?
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You can use fixture_file_upload
include ActionDispatch::TestProcess in your test helper, here is an example factory:
include ActionDispatch::TestProcess
FactoryBot.define do
factory :user do
avatar { fixture_file_upload(Rails.root.join(...
Call a function from another file?
Set_up: I have a .py file for each function I need to use in a program.
17 Answers
17
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How to rename a file using Python
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Should be noted that if the files are not in the working directory you will need the full path.
– EndermanAPM
Mar 29 '17 at 11:34
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Using Html.ActionLink to call action on different controller
...ttributes
<%=Html.ActionLink("Details", "Details",
"Product", new {id = item.ID}, null) %>
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