Class: Ridgepole::Delta

Inherits:
Object
  • Object
show all
Defined in:
lib/ridgepole/delta.rb

Constant Summary collapse

SCRIPT_NAME = 
'<Schema>'.freeze

Instance Method Summary collapse

Constructor Details

#initialize(delta, options = {}) ⇒ Delta

Returns a new instance of Delta.



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# File 'lib/ridgepole/delta.rb', line 5

def initialize(delta, options = {})
  @delta = delta
  @options = options
  @logger = Ridgepole::Logger.instance
end

Instance Method Details

#differ? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridgepole/delta.rb', line 54

def differ?
  !script.empty? || !delta_execute.empty?
end

#migrate(options = {}) ⇒ Object 



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# File 'lib/ridgepole/delta.rb', line 11

def migrate(options = {})
  log_file = @options[:log_file]

  if log_file
    result = ActiveRecord::Migration.record_time do
      migrate0(options)
    end

    File.open(log_file, 'wb') { |f| f.puts JSON.pretty_generate(result) }
    result
  else
    migrate0(options)
  end
end

#script ⇒ Object 



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# File 'lib/ridgepole/delta.rb', line 26

def script
  buf = StringIO.new
  pre_buf_for_fk = StringIO.new
  post_buf_for_fk = StringIO.new

  (@delta[:add] || {}).each do |table_name, attrs|
    append_create_table(table_name, attrs, buf, post_buf_for_fk)
  end

  (@delta[:rename] || {}).each do |table_name, attrs|
    append_rename_table(table_name, attrs, buf)
  end

  (@delta[:change] || {}).each do |table_name, attrs|
    append_change(table_name, attrs, buf, pre_buf_for_fk, post_buf_for_fk)
  end

  (@delta[:delete] || {}).each do |table_name, attrs|
    append_drop_table(table_name, attrs, buf)
  end

  [
    pre_buf_for_fk,
    buf,
    post_buf_for_fk
  ].map { |b| b.string.strip }.join("\n\n").strip
end