I am trying to insert this hash into my database:
a = {"name" => "Apple"}
So I connect using IRB.
irb(main):001:0> require 'mongo'
=> true
irb(main):002:0> include Mongo
=> Object
irb(main):003:0> client = MongoClient.new("localhost",27017).db("sample").collection("stack")
=> #<Mongo::Collection:0x9ee5c74 @name="stack", @db=#<Mongo::DB:0x9ee5ee0 @name="sample", @connection
Now this is where I run into an issue:
irb(main):004:0> client.count
=> 0
irb(main):005:0> a = {"name" => "Apples"}
=> {"name"=>"Apples"}
Works fine so far. Insert was successful.
> db.stack.find().pretty()
{ "_id" : ObjectId("525ee9d79fd1b325a4000001"), "name" : "Apples" }
Works on the ruby side:
irb(main):005:0> a = {"name" => "Apples"}
=> {"name"=>"Apples"}
irb(main):006:0> client.insert(a)
=> BSON::ObjectId('525ee9d79fd1b325a4000001')
Here is where the error occurs, if I try to add the same hash again
irb(main):007:0> client.insert(a)
Mongo::OperationFailure: 11000: E11000 duplicate key error index: sample.stack.$_id_ dup key: { : ObjectId('525ee9d79fd1b325a4000001') }
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/networking.rb:103:in `send_message_with_gle'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/collection.rb:1121:in `block in send_insert_message'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/util/logging.rb:55:in `block in instrument'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/util/logging.rb:20:in `instrument'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/util/logging.rb:54:in `instrument'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/collection.rb:1119:in `send_insert_message'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/collection.rb:1111:in `insert_batch'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/collection.rb:1169:in `insert_documents'
from /var/lib/gems/1.9.1/gems/mongo-1.9.2/lib/mongo/collection.rb:389:in `insert'
from (irb):7
from /usr/bin/irb:12:in `<main>'
What? My Hash has changed
irb(main):008:0> a
=> {"name"=>"Apples", :_id=>BSON::ObjectId('525ee9d79fd1b325a4000001')}
_id field has been added to it, so how will I handle batch Inserts if this is the way its going to be done?
Why is there default behavior to add the _id to my original hash, and how do I get around it
After some searching, it seems this is behaviour in the BSON Gem.
[http://api.mongodb.org/ruby/current/BSON/ObjectId.html][1]
+ (BSON::ObjectId, Object) create_pk(doc)
File 'lib/bson/types/object_id.rb', line 91
def self.create_pk(doc)
doc.has_key?(:_id) || doc.has_key?('_id') ? doc : doc.merge!(:_id => self.new)
end
How would a person so things like:
a = {"name" => "Blue"}
2.times {client.insert(a)}