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Juan Moreno

2006-Dec-04 23:07 UTC

I need help to connect Postgres and Ruby on Rails Please.

Hello to everyone, I have a problem that is giving me a headache, and
trying to do a project in Ruby on Rails and I need to connect with a
Data Base that is en Postgres, the truth is that I didn’t think that it
was so hard to connect a DB with postgres because I was working with
Msyql and everything was easy. This are the thinks that I have install
in my computer.
1.  Debian GNU/Linux, kernel 2.4.27-2-686.
2.  Ruby 1.8.2
3.  Postgresql 7.4.7-6 sarge1
4.  Gems: actionmailer-1.2.5, actionpack-1.12.5, actionwebservice-1.1.6,
activerecord-1.14.4, activesupport-1.3.1, postgres-pr-0.2.1,
rails-1.1.6, rake-0.7.1
5.  ruby-postgres-0.7.1.tar.tar
The error is that after I install everything that I need, I can’t
connect with my DB, in my project in the folder /app/models I made a
archive with the same name off my table, remembering that my real table
the name is in plural bout in my project in singular, the thinks that I
wrote look something like this
ActiveRecord::Base.establish_connection(
    :adapter  => "postgresql",
    :host     => "localhost",
    :port     => "5432",
    :database => "mundo",
    :username => "usuario",
    :password => "123456"
   )
class Usuario < ActiveRecord::Base
end
When I try to save something in my DB the error that appears is like
this:

TypeError in PruebaController#guardar
can''t convert String into Integer
RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/postgresql_adapter.rb:24:in
`initialize''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/postgresql_adapter.rb:24:in
`connect''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/postgresql_adapter.rb:24:in
`postgresql_connection''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:251:in
`send''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:251:in
`connection_without_query_cache=''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/query_cache.rb:54:in
`connection=''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:220:in
`retrieve_connection''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:78:in
`connection''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:696:in
`columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1969:in
`attributes_from_column_definition''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1351:in
`initialize_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/callbacks.rb:236:in
`initialize''
app/controllers/prueba_controller.rb:9:in `new''
app/controllers/prueba_controller.rb:9:in `guardar''
-e:4:in `load''
-e:4
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
/usr/lib/ruby/1.8/webrick/server.rb:172:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:161:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:161:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start''

Request
Parameters: {"commit"=>"Guardar",
"usuario"=>{"apellido"=>"GGGGGG",
"cedula"=>"888888",
"nombre"=>"MMMMM",
"telefono"=>"5555555"}}
Show session dump
flash: !ruby/hash:ActionController::Flash::FlashHash {}
Response
Headers: {"cookie"=>[],
"Cache-Control"=>"no-cache"}
Pleas if someone know how to help me I’ll be grateful.
From Venezuela. El_gocho says thank you.
P.S: sorry if I wrote something wrong, my English writhing is not so
good.
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Jeremy Kemper

2006-Dec-04 23:19 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please.

On 12/4/06, Juan Moreno
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> The error is that after I install everything that I need, I can''t
> connect with my DB, in my project in the folder /app/models I made a
> archive with the same name off my table, remembering that my real table
> the name is in plural bout in my project in singular, the thinks that I
> wrote look something like this
>
> ActiveRecord::Base.establish_connection(
>     :adapter  => "postgresql",
>     :host     => "localhost",
>     :port     => "5432",
>     :database => "mundo",
>     :username => "usuario",
>     :password => "123456"

In config/database.yml

# Host and port are unnecessary if your database is local.
development:
  adapter: postgresql
  database: mundo
  username: usuario
  password: 123456

Then run ./script/console and do
  class Usuario < ActiveRecord::Base; end
  Usuario.find(:all)

You should see "select * from usuarios" in your log/development.log

jeremy


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Juan Moreno

2006-Dec-05 20:10 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

Jeremy Kemper wrote:> On 12/4/06, Juan Moreno
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>     :port     => "5432",
>>     :database => "mundo",
>>     :username => "usuario",
>>     :password => "123456"
> 
> 
> In config/database.yml
> 
> # Host and port are unnecessary if your database is local.
> development:
>   adapter: postgresql
>   database: mundo
>   username: usuario
>   password: 123456
> 
> Then run ./script/console and do
>   class Usuario < ActiveRecord::Base; end
>   Usuario.find(:all)
> 
> You should see "select * from usuarios" in your
log/development.log
> 
> jeremyHello my friend, well I try to do what you wrote me bout I still have a 
problem, I changed my
ActiveRecord::Base.establish_connection(
    :adapter  => "postgresql",
    :host     => "localhost",
    :port     => "5432",
    :database => "mundo",
    :username => "usuario",
    :password => "123456"
   )
class Usuario < ActiveRecord::Base
end
for something like this
ActiveRecord::Base.establish_connection(
    :adapter  => "postgresql",
    :database => "mundo",
    :username => "usuario",
    :password => "123456"
   )
class Usuario < ActiveRecord::Base
end
and now I have this problem, when I try to save some data I received a 
javascript error that says “The connection was refused when attempting 
to contact localhost:3000 ”.
Please if you can help I’ll be grateful.
Thank you. El gocho – From Venezuela
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Ilan Berci

2006-Dec-05 21:26 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

Juan Moreno wrote:
> 
> 1.  Debian GNU/Linux, kernel 2.4.27-2-686.
> 2.  Ruby 1.8.2
> 3.  Postgresql 7.4.7-6 sarge1
> 4.  Gems: actionmailer-1.2.5, actionpack-1.12.5, actionwebservice-1.1.6,
> activerecord-1.14.4, activesupport-1.3.1, postgres-pr-0.2.1,
> rails-1.1.6, rake-0.7.1
> 5.  ruby-postgres-0.7.1.tar.tar
> 
Juan,

I believe you have the wrong connector for postgresql, for anything at 
or above 7.4, you need gem: postgres-pr

I see you have gems installed, so you are all set
gem install postgres-pr

hope this helps

ilan

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Jeremy Kemper

2006-Dec-05 22:12 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

On 12/5/06, Ilan Berci
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> I believe you have the wrong connector for postgresql, for anything at
> or above 7.4, you need gem: postgres-pr
>
> I see you have gems installed, so you are all set
> gem install postgres-pr

This is not true.

postgres-pr is the pure-Ruby postgres client

The other postgres libs are C bindings for the official libpq client.

The C bindings are more robust, fully featured, and faster.

jeremy


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Ned Wolpert

2006-Dec-06 15:03 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

I was wondering if there are any real benchmarks using the pure ruby
postgresql db driver versus the c-bindings one, or if people just
''believe''
one is faster then the other.

(In Java land, pure Java oracle-JDBC driver is actually faster then the
OCI/native wrapper one (type-4 versus type-2 I think) due to time taken in
the conversion between native c-structs and Java objects.  But I''m not
sure
Ruby has the same problem...)

On 12/5/06, Jeremy Kemper <jeremy-w7CzD/W5Ocjk1uMJSBkQmQ@public.gmane.org>
wrote:>
> On 12/5/06, Ilan Berci
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
> >
> > I believe you have the wrong connector for postgresql, for anything at
> > or above 7.4, you need gem: postgres-pr
> >
> > I see you have gems installed, so you are all set
> > gem install postgres-pr
>
>
> This is not true.
>
> postgres-pr is the pure-Ruby postgres client
>
> The other postgres libs are C bindings for the official libpq client.
>
> The C bindings are more robust, fully featured, and faster.
>
> jeremy
>
>

-- 
Virtually, Ned Wolpert

"Settle thy studies, Faustus, and begin..."   --Marlowe

Discere docendo...


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Lugovoi Nikolai

2006-Dec-06 16:25 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

2006/12/6, Ned Wolpert
<ned.wolpert-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:> I was wondering if there are any real benchmarks using the pure ruby
> postgresql db driver versus the c-bindings one, or if people just
''believe''
> one is faster then the other.
>
Here follow some really dumb benchmarks:
------------------------------
$ cat bm-c.rb
# for ruby-postgres
require ''postgres''
require ''benchmark''
require ''common-bm''
PGconn.translate_results= ARGV[0] ? true : nil
bench_postgres( PGconn.new(''dbname=template1'') )

$ cat bm.rb
# for postgres-pr
require ''postgres''
require ''benchmark''
require ''common-bm''
# initialize(host, port, options, tty, database, user, auth
bench_postgres(PGconn.new(''localhost'', 5432, "",
nil, ''template1'',
''nnick'', nil))

$ cat comon-bm.rb
Q_S = "select 1::int, 2.0::float, 1234567.8901234::numeric,
''text''::text , generate_series(1,100)"
Q_S1 = "select now()::date , generate_series(1,100)"
Q_S2 = "select now()::time , generate_series(1,100)"
Q_S3 = "select now()::timestamptz , generate_series(1,100)"
Q_S4 = "select 2.0::float, 1234567.8901234::numeric,
''text''::text ,
generate_series(1,100), now()"
N=100

def bench_postgres(c)
Benchmark.bm do |x|
 x.report { N.times { c.query(Q_S) }}
 x.report { N.times { c.query(Q_S1) }}
 x.report { N.times { c.query(Q_S2) }}
 x.report { N.times { c.query(Q_S3) }}
 x.report { N.times { c.query(Q_S4) }}
end
puts c.query(Q_S4)[0].inspect
end
------------------------------
# I put postres-pr to lib/ and postgres.so to libpq/
$ ruby -I lib bm.rb && ruby -I libpq bm-c.rb && ruby -I libpq
bm-c.rb true
      user     system      total        real
  2.920000   0.020000   2.940000 (  3.263881)
  1.940000   0.020000   1.960000 (  2.219724)
  2.010000   0.030000   2.040000 (  2.307650)
  2.010000   0.020000   2.030000 (  2.315171)
  3.030000   0.020000   3.050000 (  3.477216)
["2", "1234567.8901234", "text", "1",
"2006-12-06 17:57:28.13353+02"]
      user     system      total        real
  0.190000   0.000000   0.190000 (  0.491127)
  0.140000   0.000000   0.140000 (  0.358521)
  0.130000   0.010000   0.140000 (  0.429801)
  0.130000   0.000000   0.130000 (  0.422406)
  0.240000   0.010000   0.250000 (  0.610914)
["2", "1234567.8901234", "text", "1",
"2006-12-06 17:57:30.752541+02"]
      user     system      total        real
  0.250000   0.010000   0.260000 (  0.535132)
  2.880000   0.030000   2.910000 (  3.146284)
  2.840000   0.080000   2.920000 (  3.209385)
  5.200000   0.010000   5.210000 (  5.500557)
  5.410000   0.050000   5.460000 (  5.851943)
[2.0, #<BigDecimal:b7d5a93c,''0.1234567890
1234E7'',16(20)>, "text", 1,
Wed Dec 06 17:57:49 +0200 2006]
-----------------------------

So, it looks like if results aren''t converted from text to Ruby types,
ruby-postgres is 10 times faster than postgres-pr.

But if ruby-postgres is set to translate values to Ruby types,
performance drops drastically on Date/Time conversion, but it is
rather fault of Ruby std libs for date parsing :(
Though, if postgres-pr would implement type conversion (and it
doesn''t), it certainly would be slower - even with support of binary
format queries ( see
http://developer.postgresql.org/pgdocs/postgres/protocol-overview.html
) - implementation in C bindings, with direct access to underlying
structures of Ruby VALUE should outperform pure Ruby code, I guess.

Maybe, in ruby-postgres 0.8.0, that was going to be released "real
soon"(TM) (
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/175563
) it will be improved :)

As for me, I like ruby-postgres better for such features as getting
value from resulting query row by name (
conn.query(...).first[''id'']
), using placeholders in statements (conn.exec("INSERT INTO foo VALUES
( $1, $2)", value_1, value_2) ), better support for large objects
(both lo_* and BYTEA), automatic translation to Ruby types (very handy
when not using magic of ActiveRecord ) etc.

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Juan Moreno

2006-Dec-08 13:58 UTC

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Re: I need help to connect Postgres and Ruby on Rails Please

Lugovoi Nikolai wrote:> 2006/12/6, Ned Wolpert
<ned.wolpert-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>> I was wondering if there are any real benchmarks using the pure ruby
>> postgresql db driver versus the c-bindings one, or if people just
''believe''
>> one is faster then the other.
>>
> 
> Here follow some really dumb benchmarks:
> ------------------------------
> $ cat bm-c.rb
> # for ruby-postgres
> require ''postgres''
> require ''benchmark''
> require ''common-bm''
> PGconn.translate_results= ARGV[0] ? true : nil
> bench_postgres( PGconn.new(''dbname=template1'') )
> 
> $ cat bm.rb
> # for postgres-pr
> require ''postgres''
> require ''benchmark''
> require ''common-bm''
> # initialize(host, port, options, tty, database, user, auth
> bench_postgres(PGconn.new(''localhost'', 5432,
"", nil, ''template1'',
> ''nnick'', nil))
> 
> $ cat comon-bm.rb
> Q_S = "select 1::int, 2.0::float, 1234567.8901234::numeric,
> ''text''::text , generate_series(1,100)"
> Q_S1 = "select now()::date , generate_series(1,100)"
> Q_S2 = "select now()::time , generate_series(1,100)"
> Q_S3 = "select now()::timestamptz , generate_series(1,100)"
> Q_S4 = "select 2.0::float, 1234567.8901234::numeric,
''text''::text ,
> generate_series(1,100), now()"
> N=100
> 
> def bench_postgres(c)
> Benchmark.bm do |x|
>  x.report { N.times { c.query(Q_S) }}
>  x.report { N.times { c.query(Q_S1) }}
>  x.report { N.times { c.query(Q_S2) }}
>  x.report { N.times { c.query(Q_S3) }}
>  x.report { N.times { c.query(Q_S4) }}
> end
> puts c.query(Q_S4)[0].inspect
> end
> ------------------------------
> # I put postres-pr to lib/ and postgres.so to libpq/
> $ ruby -I lib bm.rb && ruby -I libpq bm-c.rb && ruby -I
libpq bm-c.rb
> true
>       user     system      total        real
>   2.920000   0.020000   2.940000 (  3.263881)
>   1.940000   0.020000   1.960000 (  2.219724)
>   2.010000   0.030000   2.040000 (  2.307650)
>   2.010000   0.020000   2.030000 (  2.315171)
>   3.030000   0.020000   3.050000 (  3.477216)
> ["2", "1234567.8901234", "text",
"1", "2006-12-06 17:57:28.13353+02"]
>       user     system      total        real
>   0.190000   0.000000   0.190000 (  0.491127)
>   0.140000   0.000000   0.140000 (  0.358521)
>   0.130000   0.010000   0.140000 (  0.429801)
>   0.130000   0.000000   0.130000 (  0.422406)
>   0.240000   0.010000   0.250000 (  0.610914)
> ["2", "1234567.8901234", "text",
"1", "2006-12-06 17:57:30.752541+02"]
>       user     system      total        real
>   0.250000   0.010000   0.260000 (  0.535132)
>   2.880000   0.030000   2.910000 (  3.146284)
>   2.840000   0.080000   2.920000 (  3.209385)
>   5.200000   0.010000   5.210000 (  5.500557)
>   5.410000   0.050000   5.460000 (  5.851943)
> [2.0, #<BigDecimal:b7d5a93c,''0.1234567890
1234E7'',16(20)>, "text", 1,
> Wed Dec 06 17:57:49 +0200 2006]
> -----------------------------
> 
> So, it looks like if results aren''t converted from text to Ruby
types,
> ruby-postgres is 10 times faster than postgres-pr.
> 
> But if ruby-postgres is set to translate values to Ruby types,
> performance drops drastically on Date/Time conversion, but it is
> rather fault of Ruby std libs for date parsing :(
> Though, if postgres-pr would implement type conversion (and it
> doesn''t), it certainly would be slower - even with support of
binary
> format queries ( see
> http://developer.postgresql.org/pgdocs/postgres/protocol-overview.html
> ) - implementation in C bindings, with direct access to underlying
> structures of Ruby VALUE should outperform pure Ruby code, I guess.
> 
> Maybe, in ruby-postgres 0.8.0, that was going to be released "real
> soon"(TM) ( 
> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/175563
> ) it will be improved :)
> 
> As for me, I like ruby-postgres better for such features as getting
> value from resulting query row by name (
conn.query(...).first[''id'']
> ), using placeholders in statements (conn.exec("INSERT INTO foo VALUES
> ( $1, $2)", value_1, value_2) ), better support for large objects
> (both lo_* and BYTEA), automatic translation to Ruby types (very handy
> when not using magic of ActiveRecord ) etc.
Hello my friends, well I try all the you gays wrote me bout I don’t know 
why I still have the problem, I just want to connect a DB that is in 
Postgres with my project Ruby on Rails, bout nothing seems to work, well 
all that thinks that I had made are:
1.  install all these:
o  Debian GNU/Linux, kernel 2.4.27-2-686.
o  Ruby 1.8.2
o  Postgresql 7.4.7-6 sarge1
o  Gems: actionmailer-1.2.5, actionpack-1.12.5, actionwebservice-1.1.6, 
activerecord-1.14.4, activesupport-1.3.1, postgres-pr-0.2.1, 
rails-1.1.6, rake-0.7.1
o  ruby-postgres-0.7.1.tar.tar
2.  in my project in the folder  /app/models I made a archive with the 
same name off my table, remembering that my real table the name is in 
plural bout in my project in singular, the thinks that I wrote look 
something like this
               ActiveRecord::Base.establish_connection(
               :adapter  => "postgresql",
               :host     => "localhost",
               :port     => "5432",
               :database => "mundo",
                :username => "usuario",
                :password => "123456"
         )
class Usuario < ActiveRecord::Base
end
Ok, the first error that I had was these:
TypeError in PruebaController#guardar
can''t convert String into Integer
RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:220:in
`retrieve_connection''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:78:in
`connection''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:696:in
`columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1969:in
`attributes_from_column_definition''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1351:in
`initialize_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/callbacks.rb:236:in
`initialize''
app/controllers/prueba_controller.rb:9:in `new''
app/controllers/prueba_controller.rb:9:in `guardar''
-e:4:in `load''
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
/usr/lib/ruby/1.8/webrick/server.rb:172:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:161:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:161:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start''

Request
Parameters: {"commit"=>"Guardar",
"usuario"=>{"apellido"=>"GGGGGG",
"cedula"=>"888888",
"nombre"=>"MMMMM",
"telefono"=>"5555555"}}
Show session dump
flash: !ruby/hash:ActionController::Flash::FlashHash {}
Response
Headers: {"cookie"=>[],
"Cache-Control"=>"no-cache"}
Well a friend wrote me that the host and port aren’t necessary if my 
data was local and it is,  so I changed my connection for something like 
these
 ActiveRecord::Base.establish_connection(
               :adapter  => "postgresql",
               :database => "mundo",
                :username => "usuario",
                :password => "123456"
         )
class Usuario < ActiveRecord::Base
end
So after that, I have a different error is a javascript error that says 
“The connection was refused when attempting to contact localhost:3000 ”, 
and the error happens when a try to save something in my DB, my host is 
running because I can see all my web pages bout if I what to save 
something and I click the save button the javascript error appear.
I don’t know if someone in this community can help me, with a tutorial 
or a example the connect Postgres and Ruby on Rails, or maybe tell me 
what thinks do I have to install in what order. Please someone help me I 
don’t want to give-up with these error.
From Venezuela. El_gocho says thank you.
P.S: sorry if I wrote something wrong, my English writhing is not so 
good

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