class <%= migration_class_name %> < ActiveRecord::Migration[<%= ActiveRecord::Migration.current_version %>] <%- if migration_action == ‘add’ -%>

def change

<% attributes.each do |attribute| -%>

<%- if attribute.reference? -%>
  add_reference :<%= table_name %>, :<%= attribute.name %><%= attribute.inject_options %><%= foreign_key_type %>
<%- elsif attribute.token? -%>
  add_column :<%= table_name %>, :<%= attribute.name %>, :string<%= attribute.inject_options %>
  add_index :<%= table_name %>, :<%= attribute.index_name %><%= attribute.inject_index_options %>, unique: true
<%- elsif !attribute.virtual? -%>
  add_column :<%= table_name %>, :<%= attribute.name %>, :<%= attribute.type %><%= attribute.inject_options %>
  <%- if attribute.has_index? -%>
  add_index :<%= table_name %>, :<%= attribute.index_name %><%= attribute.inject_index_options %>
  <%- end -%>
<%- end -%>

<%- end -%>

end

<%- elsif migration_action == ‘join’ -%>

def change
  create_join_table :<%= join_tables.first %>, :<%= join_tables.second %> do |t|
  <%- attributes.each do |attribute| -%>
    <%- if attribute.reference? -%>
    t.references :<%= attribute.name %><%= attribute.inject_options %><%= foreign_key_type %>
    <%- elsif !attribute.virtual? -%>
    <%= '# ' unless attribute.has_index? -%>t.index <%= attribute.index_name %><%= attribute.inject_index_options %>
    <%- end -%>
  <%- end -%>
  end
end

<%- else -%>

def change

<% attributes.each do |attribute| -%> <%- if migration_action -%>

<%- if attribute.reference? -%>
  remove_reference :<%= table_name %>, :<%= attribute.name %><%= attribute.inject_options %><%= foreign_key_type %>
<%- else -%>
  <%- if attribute.has_index? -%>
  remove_index :<%= table_name %>, :<%= attribute.index_name %><%= attribute.inject_index_options %>
  <%- end -%>
  <%- if !attribute.virtual? -%>
  remove_column :<%= table_name %>, :<%= attribute.name %>, :<%= attribute.type %><%= attribute.inject_options %>
  <%- end -%>
<%- end -%>

<%- end -%> <%- end -%>

end

<%- end -%> end