I have the following code:
#gameRequests = GameRequest.find(:first, :conditions => ["created_on >= ?", created_on])
I'd like to find the oldest record within the last 5 minutes. How can I subtract the 5 minutes from created_on to do this? I cant seem to find any examples.
Thanks
The code you want is:
#gameRequest = GameRequest.first(:conditions => ["created_on >= ?", DateTime.now - 5.minutes])
BTW, are you sure the field is named created_on and not created_at? Also, .first gets only the first record, not all of them. For that, you need .all
gameRequests = GameRequest.find(:first, :conditions => ["created_on >= ?", created_on - 5.minute])
Try this:
#gameRequests = GameRequest.find(:first, :conditions => ["created_at >= ?", Time.now - 5.minutes], :order => "created_at ASC")
Related
This query won't return any records, when hidden_episodes_ids is empty.
:conditions => ["episodes.show_id in (?) AND air_date >= ? AND air_date <= ? AND episodes.id NOT IN (?)", #show_ids, #start_day, #end_day, hidden_episodes_ids]
If it's empty, the SQL will look like NOT IN (null)
So my solution is:
if hidden_episodes_ids.any?
*mode code*:conditions => ["episodes.show_id in (?) AND air_date >= ? AND air_date <= ? AND episodes.id NOT IN (?)", #show_ids, #start_day, #end_day, hidden_episodes_ids]
else
*mode code*:conditions => ["episodes.show_id in (?) AND air_date >= ? AND air_date <= ?", #show_ids, #start_day, #end_day]
end
But it is rather ugly (My real query is actually 5 lines, with joins and selects etc..)
Is there a way to use a single query and avoid the NOT IN (null)?
PS: These are old queries migrated into Rails 3, hence the :conditions
You should just use the where method instead as that'll help clean all of this up. You just chain it together:
scope = Thing.where(:episodes => { :show_id => #show_ids })
scope = scope.where('air_date BETWEEN ? AND ?', #start_day, #end_day)
if (hidden_episode_ids.any?)
scope = scope.where('episodes.id NOT IN (?)', hidden_episode_ids)
end
Being able to conditionally modify the scope avoids a lot of duplication.
I'm having a blonde moment and probably a brain freeze.
In my rails3 app, I have users and tasks. My users have many tasks...
I have due and overdue tasks as follows:
#due = Task.find(:all, :conditions => ["dueddate >= ? AND AND status = ?", Date.today, false], :include => :taskcategories, :order => "dueddate asc")
What I want to do in my tasks view, is list the users with due tasks...
For some reason, I can't get my head around it. I have tried this, but it's not working:
#task = Task.all
#user = User.find(:all, :conditions => ["#task.dueddate <= ? AND
#task.status = ?", Date.today + 7.days, false])
I'm sure this is easy, can anyone help me!!?
I guess this should work
updated
User.joins(:tasks)
.where("tasks.dueddate <= ? AND tasks.status = ?", Date.today + 7.days, false).group(:id)
This should work with SQLite and MySQL. However, PostgreSQL requires that you supply all the columns of the table. If it's a small table, you could simply type the names. Or you could add this method to the model:
def self.column_list
self.column_names.collect { |c| "#{self.to_s.pluralize.downcase}.#{c}"}.join(",")
end
and change .group(:id) to .group(User.column_list)
(Hi Dr. Nick!)
I'm trying to tighten things up for our app admin, and in a few places we have some pretty skeezy code.
For example, we have Markets, which contain Deals. In several places, we do something like this:
#markets = Market.find(:all, :select => ['name, id'])
#deals = Deal.find(:all, :select => ['subject, discount_price, start_time, end_time'], :conditions => ['start_time >= ? AND end_time <= ?', date1 date2])
Then in the corresponding view, we do something like this:
#markets.each do |m|
=m.name
end
#deals.sort!{ |a,b| a.market.name <=> b.market.name }
#deals.each do |d|
=d.subject
=d.market.name
end
This runs a stupid amount of queries: one to get the market names and ids, then another to get all the deal info, and then for each deal (of which there are thousands), we run yet another query to retrieve the market name, which we already have!
Tell me there is a way to get everything I need with just one query, since it's all related anyway, or at least to clean this up so it's not such a nightmare.
Thanks
You can write like this way ..
#deals_with_market_name = Deal.find(:all, :include => :market,
:select => ['subject, discount_price, start_time, end_time,market.name as market_name'],
:conditions => ['start_time >= ? AND end_time <= ?', date1 date2],
:order => "market.name")
And in view ...
#deals.each do |a|
=a.subject
=a.market_name
end
Try it...
If you use :include => :market when searching the deals you won't run a query to retrieve the market name for each deal. It'll be eager loaded.
#deals = Deal.find(:all, :include => :market)
Hope it helps.
Have a model called contact_email.date_sent
I want to be able to run a report which displays all those where the date_sent range is between date.today and date.today 5 days ago.
I assume I use something like
#send_emails = Contact_Email.find(:conditions=> ???)
But not clear what exactly is the best way. Thanks!
Try this:
ContactEmail.all(:conditions => ["date_sent >= ?", 5.days.ago.to_date])
This approach is faster than using BETWEEN clause( assuming date_sent is indexed)
Caveat:
Value of date_sent column should be less than current date.
Edit 1
To add an index in migration:
add_index :contact_emails, :date_sent
ContactEmail.find(:conditions => ['date_sent BETWEEN ? AND ?', Date.today, 5.day.ago.to_date])
If it's something you will use regularly, why not put a named_scope in the model:
named_scope :recent, lambda { |*args| {:conditions => ["date_sent > ?", (args.first || 5.days.ago)]} }
which will let you write:
ContactEmail.recent
for the last 5 days worth, or use the arg to specify your own time frame e.g. the last two weeks:
ContactEmail.recent(2.weeks.ago)
I have a model who holds 2 properties: valid_from and valid_to.
I need to select all instances that are currently valid, i.e. valid_from <= today and valid_to >= today.
i have the following find :
Mymodel.find(:all, :conditions => ["valid_from <= ? and valid_to >= ?", Date.today, Date.today])
I already thought about storing Date.today in a variable and calling that variable, but i still need to call it twice.
my_date = Date.today
Mymodel.find(:all, :conditions => ["valid_from <= ? and valid_to >= ?", my_date, my_date])
Is there a way to improve and do only one call to the variable to match all the "?" in the :conditions ?
thanks,
P.
I would use named_scope. In model add:
named_scope :valid,
:conditions =>
["valid_from <= ? and valid_to >= ?", Date.today, Date.today]
And then in your controller you can call:
#mymodels = Mymodel.valid
I think that focusing on reducing two calls to Date.today to only one call is wasting of time. It won't make your application faster or using less memory.
I'm not aware of a way to do what you're asking, but even if you could I don't think it would buy you much. I would create a named scope within your model class.
In this example, you can pass the date to the named scope, or it will default to today's date if no date is specified:
named_scope :by_valid_date, lambda { |*args|
{ :conditions => ["valid_from <= ? and valid_to >= ?",
(args.first || Date.today), (args.first || Date.today)]} }