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od_practice.partnerships.kept.first&.omd_practice&.id
I have seen people use the word kept.first to pull data from database in ruby on rail . What does these words mean ? i have tried to do some research and i seem not find any solution. Can someone explain me please ?
This is called a message send in Ruby. In some other languages, it might be called a method call.
It is sending the message kept with no arguments to the object that was the result of evaluating the beginning of the message chain. This message send will in turn result in an object being returned, and it is then sending the message first to that object, again with no arguments.
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it should be compiled and started only x times and then not anymore, should also be not hackable. for example no use of lock file.
maybe a use-counter in the binary?
im expecting suggestions to my problem here.
For this must use destructur.
Destroyed variables after scope and must nul
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Very basic but can any one tell me what are the new JVM arguments introduces in Java8?
I am not able to find any concrete list over net.
I know about a few of them only (that I got to use), like:
-parameters (for named parameters)
Since the addition of meta-space, these were added (used only a few of them)
InitialBootClassLoaderMetaspaceSize
MaxMetaspaceExpansion
MaxMetaspaceFreeRatio
MaxMetaspaceSize
MetaspaceSize
MinMetaspaceExpansion
MinMetaspaceFreeRatio
UseLargePagesInMetaspace
And one about lambda usage:
-Djdk.internal.lambda.dumpProxyClasses = /Some/Path
I only vaguely know about these two:
MinHeapFreeRatio
MaxHeapFreeRatio
I am absolutely sure there are many more...
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Are there any objects in ruby that don't respond to to_s?
The question isn't meant to ask whether it is possible to create one, which I know can be done by undef_method. Feel free to explain details, including caveats of undefining.
The BasicObject class does not define a to_s method, so any instance of that class would not have a to_s method.
We should never specialize a subclass, since the subclass would not attend to the parent expectation anymore, have a look in the Liskov Substitution Principle.
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I've burning out the past 2 days trying to come with a recipe to get all the People who have +1 an URL, I'm trying to calculate the potential reach of a publication in Google+.
I did get the public shares of a URL using Ripple, amount and users, but is not the same.
I writing my app in ruby, but at this moment, I can't care less about the language.
To get clear view of my problem, please read my comment below.
There is no API method to get a list of who as +1'd a URL. If you would like to see such a feature please open a new issue.
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So I have this line:
if self.company_changed?
And it works fine but this detects if the company has changed on the object. I need to know if the database value has changed and not if the value in memory has changed. So I tried this:
if :company_changed?
This seems to work in debug mode when I only execute the one line. If I let it run, it fails in testing on an infinite loop.
My question is what can be used in ruby to check to see if the column value has actually changed.
I'm pretty sure you're actually talking about ActiveRecord. In which case, you'd need to re-fetch the record to see if the value has changed in the database.
self.class.find(self.id).company != self.company
A general purpose method for this might be something like:
def attr_changed_in_db?(attr)
self.class.find(self.id).attributes[attr] != self.attributes[attr]
end
There is an excellent screencast on this by the great Ryan Bates.