Error connecting external DB to Rails 4 App - ruby-on-rails

Question

I am attempting to add a Postgresql Redshift Database to my Rails 4 app, for use locally and in production. I am testing in Development first.
I have altered my database.yml file to look like this:
development:
adapter: postgresql
encoding: unicode
database: new_db
pool: 5
username: test
password: password
host: test_db.us-east-1.redshift.amazonaws.com
port: 5439
Now, when I hit localhost:3000 I get this error:
permission denied to set parameter "client_min_messages" to "warning"
: SET client_min_messages TO 'warning'
I can't seem to find out what is causing this - It seems like maybe my new DB isn't allow the SET command? I'm not really sure, but any help is appreciated.

Answer 1

Just answered this somewhere else, but I had the same issues today, here's what I did and it's working now:
#app/models/data_warehouse.rb
class DataWarehouse < ActiveRecord::Base
establish_connection "redshift_staging"
#or, if you want to have a db per environment
#establish_connection "redshift_#{Rails.env}"
end
Note that we are connecting on 5439, not the default 5432 so I specify the port
Also, I specify a schema, beta, which is what we use for our unstable aggregates, you could either have a different db per environment as mentioned above, or use various schemas and include them in the search path for ActiveRecord
#config/database.yml
redshift_staging:
adapter: postgresql
encoding: utf8
database: db03
port: 5439
pool: 5
schema_search_path: 'beta'
username: admin
password: supersecretpassword
host: db03.myremotehost.us #your remote host here, might be an aws url from Redshift admin console
###OPTION 2, a direct PG Connection
class DataWarehouse < ActiveRecord::Base
attr_accessor :conn
def initialize
#conn = PG.connect(
database: 'db03',
port: 5439,
pool: 5,
schema_search_path: 'beta',
username: 'admin',
password: 'supersecretpassword',
host: 'db03.myremotehost.us'
)
end
end
[DEV] main:0> redshift = DataWarehouse
E, [2014-07-17T11:09:17.758957 #44535] ERROR -- : PG::InsufficientPrivilege: ERROR: permission denied to set parameter "client_min_messages" to "notice" : SET client_min_messages TO 'notice'
(pry) output error: #<ActiveRecord::StatementInvalid: PG::InsufficientPrivilege: ERROR: permission denied to set parameter "client_min_messages" to "notice" : SET client_min_messages TO 'notice'>
UPDATE:
I ended up going with option 1, but using this adapter for now for multiple reasons:
https://github.com/fiksu/activerecord-redshift-adapter
Reason 1: ActiveRecord postgresql adapter sets client_min_messages
Reason 2: adapter also attempts to set Time Zone, which redshift doesn't allow (http://docs.aws.amazon.com/redshift/latest/dg/c_redshift-and-postgres-sql.html)
Reason 3: Even if you change the code in ActiveRecord for the first two errors, you run into additional errors that complain that Redshift is using Postgresql 8.0, at that point I moved on to the adapter, will revisit and update if I find something better later.
I renamed my table to base_aggregate_redshift_tests (notice plural) so ActiveRecord was easily able to connect, if you can't change your table names in redshift use the set_table method I have commented out below
#Gemfile:
gem 'activerecord4-redshift-adapter', github: 'aamine/activerecord4-redshift-adapter'
Option 1
#config/database.yml
redshift_staging:
adapter: redshift
encoding: utf8
database: db03
port: 5439
pool: 5
username: admin
password: supersecretpassword
host: db03.myremotehost.us
timeout: 5000
#app/models/base_aggregates_redshift_test.rb
#Model named to match my tables in Redshift, if you want you can set_table like I have commented out below
class BaseAggregatesRedshiftTest < ActiveRecord::Base
establish_connection "redshift_staging"
self.table_name = "beta.base_aggregates_v2"
end
in console using self.table_name -- notice it queries the right table, so you can name your models whatever you want
[DEV] main:0> redshift = BaseAggregatesRedshiftTest.first
D, [2014-07-17T15:31:58.678103 #43776] DEBUG -- : BaseAggregatesRedshiftTest Load (45.6ms) SELECT "beta"."base_aggregates_v2".* FROM "beta"."base_aggregates_v2" LIMIT 1
Option 2
#app/models/base_aggregates_redshift_test.rb
class BaseAggregatesRedshiftTest < ActiveRecord::Base
set_table "beta.base_aggregates_v2"
ActiveRecord::Base.establish_connection(
adapter: 'redshift',
encoding: 'utf8',
database: 'staging',
port: '5439',
pool: '5',
username: 'admin',
password: 'supersecretpassword',
search_schema: 'beta',
host: 'db03.myremotehost.us',
timeout: '5000'
)
end
#in console, abbreviated example of first record, now it's using the new name for my redshift table, just assuming I've got the record at base_aggregates_redshift_tests because I didn't set the table_name
[DEV] main:0> redshift = BaseAggregatesRedshiftTest.first
D, [2014-07-17T15:09:39.388918 #11537] DEBUG -- : BaseAggregatesRedshiftTest Load (45.3ms) SELECT "base_aggregates_redshift_tests".* FROM "base_aggregates_redshift_tests" LIMIT 1
#<BaseAggregatesRedshiftTest:0x007fd8c4a12580> {
:truncated_month => Thu, 31 Jan 2013 19:00:00 EST -05:00,
:dma => "Cityville",
:group_id => 9712338,
:dma_id => 9999
}
Good luck!

Answer 2

What's your postgresql version? or middle ware version? it's not a original postgresql version?
you can use \set VERBOSITY verbose
and then do it again, find which function#code raise the error.
and then analyze why you cann't set client_min_messages.
I use postgresql 9.3.3 no this problem.
super and normal user can set client_min_messages correct.
digoal=# \c digoal digoal
You are now connected to database "digoal" as user "digoal".
digoal=> set client_min_messages=debug;
SET
digoal=> set client_min_messages=warning;
SET
digoal=> SET client_min_messages TO 'warning';
SET
digoal=> \c postgres digoal
You are now connected to database "postgres" as user "digoal".
postgres=> SET client_min_messages TO 'warning';
SET

Answer 3

I was able to solve the issue by opening up the postgresql adapter for Activerecord and commenting out all of the SET commands.
However, this is not a best practice at all. At the end of editing the postgresql adapter I was faced with errors due to an outdated postgres version (80002).
The right answer is just updating postgres, which unfortunately isn't possible amongst my shared Redshift DB that lives at Amazon.