Class: BranchDb::Switcher

Inherits:
Object
  • Object
show all
Defined in:
lib/branch_db/switcher.rb

Direct Known Subclasses

MysqlSwitcher, PostgresqlSwitcher, SqliteSwitcher

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rails_env, config, branch, options = {}) ⇒ Switcher

Returns a new instance of Switcher.



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# File 'lib/branch_db/switcher.rb', line 26

def initialize(rails_env, config, branch, options = {})
  @rails_env, @config, @branch = rails_env, config, branch
  @overwrite = options[:overwrite]
  @verbose = options[:verbose]
end

Class Method Details

.branches(rails_env, config) ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 22

def self.branches(rails_env, config)
  self.which(config).show_branches(rails_env, config)
end

.can_handle?(config) ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/branch_db/switcher.rb', line 14

def self.can_handle?(config)
  raise Error, "Subclasses of BranchDb::Switcher must implement #can_handle?(config)."
end

.create(rails_env, config, branch, options = {}) ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 18

def self.create(rails_env, config, branch, options = {})
  which(config).new(rails_env, config, branch, options)
end

.which(config) ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 5

def self.which(config)
  switcher = switchers.detect { |sw| sw.can_handle?(config) }
  unless switcher
    $stderr.puts "Your database adapter (#{config['adapter']}) is not supported yet."
    switcher = self # double as null switcher
  end
  switcher
end

Instance Method Details

#copy_from(from_branch) ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 68

def copy_from(from_branch)
  ensure_branch_db_exists!(from_branch)

  create_empty_database do
    puts "Copying data from #{from_branch}..."
    copy_database(from_branch, @branch)
  end
end

#create_empty_database ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 46

def create_empty_database
  db = branch_db(@branch)
  if branch_db_exists?(@branch)
    if !@overwrite
      $stderr.puts "Database #{db} exists already."
      return
    else
      puts "Dropping existing database #{db}..."
      drop_database(@branch)
    end
  end
  puts "Creating fresh database #{db}..."
  create_database(@branch)
  yield if block_given?
end

#current ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 32

def current
  # Must be implemented in subclasses.
end

#delete_database ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 62

def delete_database
  ensure_branch_db_exists!(@branch)
  puts "Dropping existing database #{branch_db(@branch)}..."
  drop_database(@branch)
end

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/branch_db/switcher.rb', line 36

def exists?
  branch_db_exists?(@branch)
end

#switch! ⇒ Object 



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# File 'lib/branch_db/switcher.rb', line 40

def switch!
  if exists?
    @config.replace(branch_config(@branch))
  end
end