65 lines
2.0 KiB
Ruby
65 lines
2.0 KiB
Ruby
require_dependency 'migration/base_dropper'
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module Migration
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class ColumnDropper < BaseDropper
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def self.drop(table:, after_migration:, columns:, delay: nil, on_drop: nil)
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validate_table_name(table)
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columns.each { |column| validate_column_name(column) }
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ColumnDropper.new(table, columns, after_migration, delay, on_drop).delayed_drop
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end
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def self.mark_readonly(table_name, column_name)
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create_readonly_function(table_name, column_name)
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ActiveRecord::Base.exec_sql <<~SQL
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CREATE TRIGGER #{readonly_trigger_name(table_name, column_name)}
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BEFORE INSERT OR UPDATE OF #{column_name}
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ON #{table_name}
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FOR EACH ROW
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WHEN (NEW.#{column_name} IS NOT NULL)
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EXECUTE PROCEDURE #{readonly_function_name(table_name, column_name)};
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SQL
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end
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private
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def initialize(table, columns, after_migration, delay, on_drop)
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super(after_migration, delay, on_drop)
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@table = table
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@columns = columns
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end
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def droppable?
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builder = SqlBuilder.new(<<~SQL)
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SELECT 1
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FROM INFORMATION_SCHEMA.COLUMNS
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/*where*/
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LIMIT 1
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SQL
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builder.where("table_schema = 'public'")
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.where("table_name = :table")
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.where("column_name IN (:columns)")
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.where(previous_migration_done)
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.exec(table: @table,
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columns: @columns,
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delay: "#{@delay} seconds",
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after_migration: @after_migration).to_a.length > 0
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end
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def execute_drop!
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@columns.each do |column|
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ActiveRecord::Base.exec_sql <<~SQL
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DROP TRIGGER IF EXISTS #{BaseDropper.readonly_trigger_name(@table, column)} ON #{@table};
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DROP FUNCTION IF EXISTS #{BaseDropper.readonly_function_name(@table, column)} CASCADE;
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SQL
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# safe cause it is protected on method entry, can not be passed in params
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ActiveRecord::Base.exec_sql("ALTER TABLE #{@table} DROP COLUMN IF EXISTS #{column}")
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end
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end
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end
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end
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