Class: Brick::SeedsGenerator

Inherits:
Rails::Generators::Base
  • Object
show all
Includes:
FancyGets
Defined in:
lib/generators/brick/seeds_generator.rb

Defined Under Namespace

Classes: SeedModel

Instance Method Summary collapse

Instance Method Details

#brick_seeds ⇒ Object 



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# File 'lib/generators/brick/seeds_generator.rb', line 18

def brick_seeds
  # %%% If Apartment is active and there's no schema_to_analyse, ask which schema they want

  ::Brick.mode = :on
  ActiveRecord::Base.establish_connection

  # Load all models
  ::Brick.eager_load_classes

  # Generate a list of viable models that can be chosen
  # First start with any existing models that have been defined ...
  existing_models = ActiveRecord::Base.descendants.each_with_object({}) do |m, s|
    s[m.table_name] = SeedModel.new(m.table_name, m, false) if !m.abstract_class? && !m.is_view? && m.table_exists?
  end
  models = (existing_models.values +
            # ... then add models which can be auto-built by Brick
            ::Brick.relations.reject do |k, v|
              k.is_a?(Symbol) || (v.key?(:isView) && v[:isView] == true) || existing_models.key?(k)
            end.map { |k, v| SeedModel.new(k, v[:class_name].constantize, true) }
           ).sort { |a, b| a.to_s <=> b.to_s }
  if models.empty?
    puts "No viable models found for database #{ActiveRecord::Base.connection.current_database}."
    return
  end

  if File.exist?(seed_file_path = "#{::Rails.root}/db/seeds.rb")
    puts "WARNING: seeds file #{seed_file_path} appears to already be present.\nOverwrite?"
    return unless gets_list(list: ['No', 'Yes']) == 'Yes'

    puts "\n"
  end

  chosen = gets_list(list: models, chosen: models.dup)
  schemas = chosen.each_with_object({}) do |v, s|
    if (v_parts = v.table_name.split('.')).length > 1
      s[v_parts.first] = nil unless [::Brick.default_schema, 'public'].include?(v_parts.first)
    end
  end
  seeds = +'# Seeds file for '
  if (arbc = ActiveRecord::Base.connection).respond_to?(:current_database) # SQLite3 can't do this!
    seeds << "#{arbc.current_database}:\n"
  elsif (filename = arbc.instance_variable_get(:@connection_parameters)&.fetch(:database, nil))
    seeds << "#{filename}:\n"
  end
  done = []
  fks = {}
  stuck = {}
  indexes = {} # Track index names to make sure things are unique
  ar_base = Object.const_defined?(:ApplicationRecord) ? ApplicationRecord : Class.new(ActiveRecord::Base)
  atrt_idx = 0    # ActionText::RichText unique index number
  @has_atrts = nil # Any ActionText::RichText present?
  # Start by making entries for fringe models (those with no foreign keys).
  # Continue layer by layer, creating entries for models that reference ones already done, until
  # no more entries can be created.  (At that point hopefully all models are accounted for.)
  while (fringe = chosen.reject do |seed_model|
                    tbl = seed_model.table_name
                    snag_fks = []
                    snags = ::Brick.relations.fetch(tbl, nil)&.fetch(:fks, nil)&.select do |_k, v|
                      # Skip any foreign keys which should be deferred ...
                      !Brick.drfgs[tbl]&.any? do |drfg|
                        drfg[0] == v.fetch(:fk, nil) && drfg[1] == v.fetch(:inverse_table, nil)
                      end &&
                      v[:is_bt] && !v[:polymorphic] && # ... and polymorphics ...
                      tbl != v[:inverse_table] && # ... and self-referencing associations (stuff like "parent_id")
                      !done.any? { |done_seed_model| done_seed_model.table_name == v[:inverse_table] } &&
                      ::Brick.config.ignore_migration_fks.exclude?(snag_fk = "#{tbl}.#{v[:fk]}") &&
                      snag_fks << snag_fk
                    end
                    if snags&.present?
                      # puts snag_fks.inspect
                      stuck[tbl] = snags
                    end
                  end
        ).present?
    seeds << "\n"
    # Search through the fringe to see if we should bump special dependent classes forward to the next fringe.
    # (Currently only ActiveStorage::Attachment if there's also an ActiveStorage::VariantRecord in the same
    # fringe, and always have ActionText::EncryptedRichText at the very end.)
    fringe_classes = fringe.map { |f| f.klass.name }
    unless (asa_idx = fringe_classes.index('ActiveStorage::Attachment')).nil?
      fringe.slice!(asa_idx) if fringe_classes.include?('ActiveStorage::VariantRecord')
    end
    unless (atert_idx = fringe_classes.index('ActionText::EncryptedRichText')).nil?
      fringe.slice!(atert_idx) if fringe_classes.length > 1
    end
    fringe.each do |seed_model|
      tbl = seed_model.table_name
      next unless ::Brick.config.exclude_tables.exclude?(tbl) &&
                  (relation = ::Brick.relations.fetch(tbl, nil))&.fetch(:cols, nil)&.present? &&
                  (klass = seed_model.klass).table_exists?

      pkey_cols = (rpk = relation[:pkey].values.flatten) & (arpk = [ar_base.primary_key].flatten.sort)
      # In case things aren't as standard
      if pkey_cols.empty?
        pkey_cols = if rpk.empty? # && relation[:cols][arpk.first]&.first == key_type
                      arpk
                    elsif rpk.first
                      rpk
                    end
      end
      schema = if (tbl_parts = tbl.split('.')).length > 1
                 if tbl_parts.first == (::Brick.default_schema || 'public')
                   tbl_parts.shift
                   nil
                 else
                   tbl_parts.first
                 end
               end

      # %%% For the moment we're skipping polymorphics
      fkeys = relation[:fks].values.select { |assoc| assoc[:is_bt] && !assoc[:polymorphic] }
      # Refer to this table name as a symbol or dotted string as appropriate
      # tbl_code = tbl_parts.length == 1 ? ":#{tbl_parts.first}" : "'#{tbl}'"

      has_rows = false
      is_empty = true
      klass.order(*pkey_cols).each do |obj|
        unless has_rows
          has_rows = true
          seeds << "  puts 'Seeding: #{klass.name}'\n"
        end
        is_empty = false
        pk_val = obj.send(pkey_cols.first)
        var_name = "#{tbl.gsub('.', '__')}_#{brick_escape(pk_val)}"
        fk_vals = []
        data = []
        updates = []
        relation[:cols].each do |col, _col_type|
          next if !(fk = fkeys.find { |assoc| col == assoc[:fk] }) &&
                  pkey_cols.include?(col)

          begin
            if (val = obj.send(col)) && (val.is_a?(Time) || val.is_a?(Date))
              val = val.to_s
            end
          rescue StandardError => e # ActiveRecord::Encryption::Errors::Configuration
          end
          if fk
            inv_tbl = fk[:inverse_table].gsub('.', '__')
            fk_vals << "#{fk[:assoc_name]}: #{inv_tbl}_#{brick_escape(val)}" if val
          else
            val = case val.class.name
                  when 'ActiveStorage::Filename'
                    val.to_s.inspect
                  when 'ActionText::RichText'
                    ensure_has_atrts(updates)
                    atrt_var = "atrt#{atrt_idx += 1}"
                    atrt_create = "(#{atrt_var} = #{val.class.name}.create(name: #{val.name.inspect}, body: #{val.to_trix_html.inspect
                                  }, record_type: #{val.record_type.inspect}, record_id: #{var_name}.#{pkey_cols.first
                                  }, created_at: DateTime.parse('#{val.created_at.inspect}'), updated_at: DateTime.parse('#{val.updated_at.inspect}')))"
                    updates << "#{var_name}.update(#{col}: #{atrt_create})\n"
                    # obj.send(col)&.embeds_blobs&.each do |blob|
                      updates << "atrt_ids[[#{val.id}, '#{val.class.name}']] = #{atrt_var}.id\n"
                    # end
                    next
                  else
                    val.inspect
                  end
            data << "#{col}: #{val}" unless val == 'nil'
          end
        end
        case klass.name
        when 'ActiveStorage::VariantRecord'
          ensure_has_atrts(updates)
          updates << "atrt_ids[[#{obj.id}, '#{klass.name}']] = #{var_name}.id\n"
        end
        # Make sure that ActiveStorage::Attachment and ActionText::EncryptedRichText get
        # wired up to the proper record_id
        if klass.name == 'ActiveStorage::Attachment' || klass.name == 'ActionText::EncryptedRichText'
          record_class = data.find { |d| d.start_with?('record_type: ') }[14..-2]
          record_id = data.find { |d| d.start_with?('record_id: ') }[11..-1]
          data.reject! { |d| d.start_with?('record_id: ') || d.start_with?('created_at: ') || d.start_with?('updated_at: ') }
          data << "record_id: atrt_ids[[#{record_id}, '#{record_class}']]"
          seeds << "#{var_name} = #{klass.name}.find_or_create_by(#{(fk_vals + data).join(', ')}) do |asa|
  asa.created_at = DateTime.parse('#{obj.created_at.inspect}')#{"
  asa.updated_at = DateTime.parse('#{obj.updated_at.inspect}')" if obj.respond_to?(:updated_at)}
end\n"
        else
          seeds << "#{var_name} = #{seed_model.klass.name}.create(#{(fk_vals + data).join(', ')})\n"
          klass.attachment_reflections.each do |k, v|
            if (attached = obj.send(k))
              ensure_has_atrts(updates)
              updates << "atrt_ids[[#{obj.id}, '#{klass.name}']] = #{var_name}.id\n"
            end
          end
        end
        updates.each { |update| seeds << update } # Anything that needs patching up after-the-fact
      end
      seeds << "  # (Skipping #{seed_model.klass.name} as it has no rows)\n" unless has_rows
      File.open(seed_file_path, "w") { |f| f.write seeds }
    end
    done.concat(fringe)
    chosen -= done
  end
  stuck_counts = Hash.new { |h, k| h[k] = 0 }
  chosen.each do |leftover|
    puts "Can't do #{leftover.klass.name} because:\n  #{stuck[leftover.table_name].map do |snag|
      stuck_counts[snag.last[:inverse_table]] += 1
      snag.last[:assoc_name]
    end.join(', ')}"
  end
  puts "\n*** Created seeds for #{done.length} models in db/seeds.rb ***"
  if (stuck_sorted = stuck_counts.to_a.sort { |a, b| b.last <=> a.last }).length.positive?
    puts "-----------------------------------------"
    puts "Unable to create seeds for #{stuck_sorted.length} tables#{
      ".  Here's the top 5 blockers" if stuck_sorted.length > 5
    }:"
    pp stuck_sorted[0..4]
  end
end