Module: Sequel::Plugins::ColumnSelect

Defined in:
lib/sequel/plugins/column_select.rb

Overview

The column_select plugin changes the default selection for a model dataset to explicit select all columns from the table: table.column1, table.column2, table.column3, .... This makes it simpler to add columns to the model’s table in a migration concurrently while running the application, without it affecting the operation of the application.

Note that by default on databases that supporting RETURNING, using explicit column selections will cause instance creations to use two queries (insert and refresh) instead of a single query using RETURNING. You can use the insert_returning_select plugin to automatically use RETURNING for instance creations for models where the column_select plugin automatically sets up an explicit column selection.

Usage:

# Make all model subclasses explicitly select qualified columns
Sequel::Model.plugin :column_select

# Make the Album class select qualified columns
Album.plugin :column_select

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Class Method Details

.configure(model) ⇒ Object

Modify the current model’s dataset selection, if the model has a dataset.



28
29
30
31
32
 
# File 'lib/sequel/plugins/column_select.rb', line 28

def self.configure(model)
  model.instance_eval do
    self.dataset = dataset if @dataset
  end
end