Class: ActiveRecord::Migration

Inherits:
Object
  • Object
show all
Defined in:
lib/jun/active_record/migration.rb

Instance Method Summary collapse

Instance Method Details

#add_column(table_name, column_name, column_type, options = {}) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 13

def add_column(table_name, column_name, column_type, options = {})
  sql = ["ALTER TABLE #{table_name} ADD COLUMN #{column_name}"]

  sql << column_type.to_s.upcase
  sql << "NOT NULL" if options[:null] == false
  sql << "DEFAULT #{options[:default]}" if options[:default]
  sql << "UNIQUE" if options[:unique] == true

  execute(sql.join(" "))
end

#create_table(table_name, options = {}) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 28

def create_table(table_name, options = {})
  sql = "CREATE TABLE IF NOT EXISTS #{table_name}"
  column_options = []

  if options[:id] || !options.key?(:id)
    column_options << {
      name: :id,
      type: :integer,
      primary_key: true,
      null: false
    }
  end

  column_options += options.fetch(:columns, [])

  columns_sql = column_options.map do |column|
    next(column) if column.is_a?(String)

    column_sql = []

    column_sql << column[:name]
    column_sql << column[:type]&.to_s&.upcase
    column_sql << "PRIMARY KEY" if column[:primary_key] == true
    column_sql << "NOT NULL" if column[:null] == false
    column_sql << "DEFAULT #{column[:default]}" if column[:default]
    column_sql << "UNIQUE" if column[:unique] == true

    column_sql.compact.join(" ")
  end

  sql += " (#{columns_sql.join(", ")})"
  sql += ";"

  execute(sql)
end

#down ⇒ Object

Raises:

  • (NoMethodError) 


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# File 'lib/jun/active_record/migration.rb', line 9

def down
  raise NoMethodError, "Subclass must implement method."
end

#drop_table(table_name) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 64

def drop_table(table_name)
  execute("DROP TABLE IF EXISTS #{table_name};")
end

#execute(*args) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 72

def execute(*args)
  ActiveRecord::Base.connection.execute(*args)
end

#remove_column(table_name, column_name) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 24

def remove_column(table_name, column_name)
  execute("ALTER TABLE #{table_name} DROP COLUMN #{column_name};")
end

#rename_table(old_table_name, new_table_name) ⇒ Object 



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# File 'lib/jun/active_record/migration.rb', line 68

def rename_table(old_table_name, new_table_name)
  execute("ALTER TABLE #{old_table_name} RENAME TO #{new_table_name};")
end

#up ⇒ Object

Raises:

  • (NoMethodError) 


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# File 'lib/jun/active_record/migration.rb', line 5

def up
  raise NoMethodError, "Subclass must implement method."
end