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rails 3 validation on uniqueness on multiple attributes
...ls 3:
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}
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How to make join queries using Sequelize on Node.js
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User.hasMany(Post, {foreignKey: 'user_id'})
Post.belongsTo(User, {foreignKey: 'user_id'})
Post.find({ where: { ...}, include: [User]})
Which will give you
SELECT
`posts`.*,
`users`.`username` AS `users.username`, `users`.`email` AS `user...
Form inside a form, is that alright? [duplicate]
Whether we can have a form inside another form?. Is there any problem with that.
9 Answers
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Set select option 'selected', by value
..."I have a select field with some options in it..." so it's not empty, therefore solution remains correct.
– pinghsien422
Jul 10 '14 at 17:37
8
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How to send a message to a particular client with socket.io
...,
message:[the message to be sent as string]
}
On the server, listen for messages. When a message is received, emit the data to the receiver.
users[data.to].emit('receivedMessage', data)
On the client, listen for emits from the server called 'receivedMessage', and by reading the data you ca...
How to include layout inside layout?
...
Edit: As in a comment rightly requested here some more information. Use the include tag
<include
android:layout_width="match_parent"
android:layout_height="wrap_content"
layout="@layout/yourlayout" />
to include the layout you want to reuse.
Check this link out...
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Extract value of attribute node via XPath
... argument as xs:string. In case its argument is an attribute, it will therefore return the attribute's value as xs:string.
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Update MongoDB field using value of another field
...ion 4.2 also introduced the $set pipeline stage operator which is an alias for $addFields. I will use $set here as it maps with what we are trying to achieve.
db.collection.<update method>(
{},
[
{"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
Mon...
How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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Clone private git repo with dockerfile
...otected which was causing the problem, a working file is now listed below (for help of future googlers)
FROM ubuntu
MAINTAINER Luke Crooks "luke@pumalo.org"
# Update aptitude with new repo
RUN apt-get update
# Install software
RUN apt-get install -y git
# Make ssh dir
RUN mkdir /root/.ssh/
# C...