Class: Branchbot::BranchSwitcher

Inherits:
Object
  • Object
show all
Defined in:
lib/branchbot/branch_switcher.rb

Instance Method Summary collapse

Constructor Details

#initialize(app_root: '.', erb_in_database_yml: true) ⇒ BranchSwitcher 



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# File 'lib/branchbot/branch_switcher.rb', line 3

def initialize(app_root: '.', erb_in_database_yml: true)
  @app_root = app_root
  @project_root = %x[git rev-parse --show-toplevel].strip
  @dump_folder = "#{@project_root}/.db_branch_dumps"
  @erb_in_database_yml = erb_in_database_yml
end

Instance Method Details

#switch_from(prev_ref) ⇒ Object 



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# File 'lib/branchbot/branch_switcher.rb', line 10

def switch_from(prev_ref)
  # Get the current (destination) branch
  @destination_branch = `git rev-parse --abbrev-ref HEAD`.strip

  # Since we're just given a commit ID referencing the branch head we're coming from,
  # it could be at the head of multiple branches. We can assume the source isn't the same as the
  # destination branch, so we can remove that immediately.
  @source_branches = branches_from_refhead(prev_ref).reject{ |b| b == @destination_branch }

  # Load Rails DB config and grab database name
  @rails_db_config = YAML.load(db_config_yml)
  dev_database_name = @rails_db_config['development']['database']

  begin
    @adapter = Adapters::Abstract.build(@rails_db_config['development'], @dump_folder)
  rescue Adapters::UnsupportedDatabase => e
    puts "\nERROR: #{e.message}"
    exit
  end

  # Ensure dump directory exists
  unless Dir.exists?(@dump_folder)
    Dir.mkdir @dump_folder
  end

  # Don't do anything if the source and destination branches are the same or nonexistent
  unless @source_branches.include?(@destination_branch) || @source_branches.empty? || (@source_branches | [@destination_branch]).any?{ |b| b == '' }
    # Dump database for source branches
    if @source_branches.all? { |branch| @adapter.dump(branch) }
      # Restore dump from this branch, if it exists
      if @adapter.dump_exists?(@destination_branch)
        if @adapter.restore(@destination_branch)
          prepare_test_database
        end
      else
        print "No DB dump for #{dev_database_name} on the '#{@destination_branch}' branch was found!\n"
        print "The state of your database has been saved for when you return to the '#{@source_branches.join('\' or \'')}' branch, but its current state has been left unchanged.  You are now free to make changes to it that are specific to this branch, and they will be saved when you checkout a different branch, then restored when you checkout this one again.\n"
      end
    else
      print "Failed to dump database. Halting.\n"
    end
  end
end