Displaying 20 results from an estimated 3000 matches similar to: "Arel table aliases and ActiveRecord::Relation help: how to specify "multiple has_many items in a query""
2012 Dec 18
1
Arel limit Where if fields are present
I trying to create a select using Arel but I''m passing three parameters, I
want to include the parameters only if they are different to nil or blank.
Here is my method:
def self.advsearch(summary_description, specialties, place)
User.joins(:experience,:summary,:information)
.where(Information.arel_table[:business].eq(false))
2010 Jun 20
0
ActiveRecord and ARel: correlated subqueries?
I''m trying to figure out how to use ActiveRecord in conjunction with
ARel. In particular, I''d like to replace my residual literal SQL with
ARel, if only I could see how.
Let''s take Article with multiple Versions as an example. With ARel
alone, I can find articles with their latest versions like this
articles = Article.arel_table
versions = Article.arel_table
2012 Jan 03
1
Can Arel handle UPPER and LIKE condition?
Hello all, I''ve recently been on a project where somewhere needs
using case insensitive search(using UPPER(name) LIKE '''') and LIKE condition,
I want to use arel and don''t use the old style string concatenation,
can arel handle this?
But I check on arel documentation, doesn''t seems have any upper/like
operator,
and check on arel source, under
2011 Nov 22
4
A "strict Arel" mode for ActiveRecord to prevent SQL injection vulnerabilities
Hello rubyonrails-core,
I’ve been looking into possible changes to ActiveRecord / Arel to make it
easier to write Rails applications that are free of SQL injection
vulnerabilities, and in particular do so in a way that makes it easy for a
code reviewer to verify that the app is safe from such bugs.
The concern:
-----------------
With the ActiveRecord API as is, it’s relatively easy to write
2012 Sep 19
0
How to copy model with arel_table instance
Hi all
I want to make copy of current scoped object, then change some stuff in
arel_table(i need to change table_alias, because i have complicated query)
and arel(SelectManager)
def self.do_smth
query = scoped.dup
puts query.arel_table.object_id == scoped.arel_table.object_id # true
end
Theoretically i can dup arel(SelectManager) but i can not find how to add
table alias to that instance
2011 Jul 25
5
Arel quiz: complex queries with associations
I have a real-world application with some complex queries that I want to
convert to Arel (as part of an upgrade to Rails 3.1). So that I can
understand what I''m doing before I flail around in my real app, I wrote
a little sample app (just the models) with some similar associations --
one table joined with itself and more tables that join to another table,
so there are some queries that
2012 Feb 29
2
How to replace the values in a column
Dear All,
I've been searching relevant topics about replacing values, none seemed to
be applicable to me...
I have a file with many many varieties, and want to replace some of them
into different names.
I tried various of ways, still don't know how to do that most efficiently..
Here is part of the example data:
Gen Rep
A_1 1
A_1 2
A_2 1
A_2 2
B_1 1
B_1
2006 Jun 06
1
Problems using quadprog for solving quadratic programming problem
Hi,
I'm using the package quadprog to solve the following quadratic programming problem.
I want to minimize the function
(b_1-b_2)^2+(b_3-b_4)^2
by the following constraints b_i, i=1,...,4:
b_1+b_3=1
b_2+b_4=1
0.1<=b_1<=0.2
0.2<=b_2<=0.4
0.8<=b_3<=0.9
0.6<=b_4<=0.8
In my opinion the solution should be b_1=b_2=0.2 und b_3=b_4=0.8.
Unfortunately R doesn't find
2011 May 11
2
Issue with Arel::SelectManager and insert Method
Hello,
Arel::SelectManager (arel 2.0.9) uses following statement to insert a
new record:
@engine.connection.insert im.to_sql, ''AREL'', primary_key_name,
primary_key_value
But in DatabaseStatements insert ist defined as:
insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
Actually, Arel::SelectManager does not use the sequence name. This
leads to issues
2011 Apr 10
0
Arel Union does not support #order or #limit
I just posted this ticket in Lighthouse, but thought perhaps some
discussion here would help point me in the right direction toward a
solution. Here is a description of the problem (from the ticket - https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/6693-arel-union-does-not-support-order-or-limit)
:
> If we take two `ActiveRecord::Relations` and join them via `union`:
2012 Mar 13
2
[Arel]Building query, but can't get a proper output
I have the following code:
advertisements_arel = Advertisement.order("advertisements.id
DESC").arel
@advertisements = (params[:website_id].present? ?
advertisements_arel.where(:website_id => params[:website_id]) :
advertisements_arel).to_a
It returns a struct Arel::SelectManager::Row data
But I''d like it to return an array of Advertisement objects (like it
would
2011 Jun 04
0
Rails 3.1 : Complex database query with Arel 2
Hi,
I''ve search for documentations on queries with Arel 2 but there is
pretty nothing and all I''ve found is for Arel 1 so I''ve run into
NoMethodError: undefined method `[]'' for
#<Arel::SelectManager:0x00000003f1b820> errors with join syntax.
My query is barely simple but involve nesting queries. I have 4 tables.
Assets, Deposits, Orders and OrderLines
2010 May 12
0
OT? Using Arel to generate table names in multiple self join query
Firstly I''m sorry if this is off-topic but I think it''s a question
that won''t be answered without good core knowledge.
I have written a multiple self join query something like this:
Person.find :all,
:select => ''children_people_3.*'',
:joins => { :children => { :children => :children } },
:conditions => {
:people => { :name
2011 Apr 14
0
arel engine
I want to write an arel engine to run an arel-based client against a RESTful
back-end.
I''ve seen people talk about it, but haven''t seen it actually done.
Is it possible? What is the best place to find info/examples on how to do
it?
tx, Andy
--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To post to this
2010 Nov 15
1
Arel 2 isn't playing nice with my legacy tables
Specifically, it''s not playing nice with any type that it doesn''t recognize,
eg. SET, ENUM, etc..
Just trying to start my Rails 3.0.2 app I get a NotImplementedError
exception "Column type `` is not currently handled" on the first SET field
it encounters.
Am I missing something here? Should I be disabling Arel for legacy tables
or something?
Thanks,
Jason
--
You
2011 Sep 02
1
Using capture.output within a function
Dear R-users
I'm running a maximum likelihood procedure using the spg package. I'd like
to save some output produced in each iteration to a file, but if I put the
capture.output() within the function I get the following message; Error in
spg(par = startval, fn = loglik, gr = NULL, method = 3, lower = lo, :
Failure in initial function evaluation!Error in -fn(par, ...) : invalid
argument
2011 Feb 22
0
Arel: misunderstanding with intersections
Hi,
I''ve been playing with Arel for a few days, but I feel really confused
about predicates / arrays intersection.
Let''s say I have 3 models: users, (bank) accounts and transfers. An
account belongs to a user, and a transfer is made of a source and
target accounts (see the snippets below).
Given a user, I want to query his transfers. I can go this way in the
User class:
def
2007 Jul 14
0
ts model challenge (transfer function)
Dear useRs,
I am trying to model a time series with a transfer function. I think
it can be put into the ARMA framework, and estimated with the 'arima'
function (and others have made similar comments on this list). I have
tried to do that, but the results have so far been disappointing.
Maybe I am trying to make 'arima' do something it can't...
The data are time series of
2011 Mar 31
0
dfsane arguments
Hi there,
I'm trying to solve 2 nonlinear equations in 2 unknowns using the BB
package.
The first part of my program solves 3 ODEs using the deSolve package. This
part works. The output is used as parameter values in the functions I need
to solve.
The second part is to solve 2 equations in 2 unknowns. This does not work. I
get the error message "unexpected end of input". So what
2006 May 17
2
Association data clobbering (foreign keys too?)
Can someone please confirm or correct the following statements?
If I have the following tables
create table as (id int, [...], b_id int);
create table bs (id int, [...], a_id int);
create table as_bs (a_id int, b_id int);
and the associations woould be defined like this
class A << ...
habtm :bs
belongs_to :b
end
so my Model A has a habtm collection of Bs *plus* a direct