Module: Sequel::Plugins::FromCsv::ClassMethods

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

Instance Method Summary collapse

Instance Method Details

#seed_from_csv(csv_path, delete: false) ⇒ Object

Synchronizes a table’s data with a CSV file



10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/sequel/plugins/from_csv.rb', line 10

def seed_from_csv csv_path, delete: false

  # Read the source CSV file
  data = CSV.table csv_path

  # Ensure the ID column exists
  unless data.first[:id]
    raise "CSV file #{csv_path} must contain an id column"
  end

  self.db.transaction do

    # UPSERT
    data.each do |row|
      row = row.to_h # Convert CSV::Row to Hash
      self.dataset.insert_conflict(target: :id, update: row).insert row
    end

    # DELETE old rows
    if delete
      self.exclude("id IN ?", data.map{|row| row[:id]}).delete
    end

    # Update the table's sequence
    self.db.run <<~SQL
      SELECT
        setval(pg_get_serial_sequence('#{self.simple_table}', 'id'), coalesce(max(id), 1), true)
      FROM
        #{self.simple_table}
    SQL

  end

end