bulk_data_methods

MixIn used to extend ActiveRecord::Base classes implementing bulk insert and update operations through {#create_many} and {#update_many}.

Examples

class Company < ActiveRecord::Base
  extend BulkMethodsMixin
end

---

BULK creation of many rows:

example no options used

rows = [
           { :name => 'Keith', :salary => 1000 },
           { :name => 'Alex', :salary => 2000 }
       ]
Employee.create_many(rows)

example with :returning option to returns key value

rows = [
           { :name => 'Keith', :salary => 1000 },
           { :name => 'Alex', :salary => 2000 }
       ]
options = { :returning => [:id] }
Employee.create_many(rows, options)

example with :slice_size option (will generate two insert queries)

rows = [
           { :name => 'Keith', :salary => 1000 },
           { :name => 'Alex', :salary => 2000 },
           { :name => 'Mark', :salary => 3000 }
     ]
options = { :slice_size => 2 }
Employee.create_many(rows, options)

---

BULK updates of many rows:

example using "set_array" to add the value of "salary" to the specific employee's salary the default where clause matches IDs so, it works here.

rows = [
           { :id => 1, :salary => 1000 },
           { :id => 10, :salary => 2000 },
           { :id => 23, :salary => 2500 }
     ]
options = { :set_array => '"salary = datatable.salary"' }
Employee.update_many(rows, options)

example using where clause to only update salaries that haven't already been updated (forced exampled).

rows = [
           { :id => 1, :salary => 1000, :company_id => 10 },
           { :id => 10, :salary => 2000, :company_id => 12 },
           { :id => 23, :salary => 2500, :company_id => 5 }
     ]
options = {
     :set_array => '"salary = datatable.salary"',
     :where_datatable => '"#{table_name}.salary <> datatable.salary"'
          }
  Employee.update_many(rows, options)

example setting where clause to the KEY of the hash passed in and the set_array is generated from the VALUES

rows = {
           { :id => 1 } => { :salary => 100000, :company_id => 10 },
           { :id => 10 } => { :salary => 110000, :company_id => 12 },
           { :id => 23 } => { :salary => 90000, :company_id => 5 }
     }
Employee.update_many(rows)