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 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
 
# 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)
  # 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"
    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: #{seed_model.klass.name}'\n"
        end
        is_empty = false
        pk_val = obj.send(pkey_cols.first)
        fk_vals = []
        data = []
        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 = val.to_s if val.is_a?(ActiveStorage::Filename)
            data << "#{col}: #{val.inspect}"
          end
        end
        seeds << "#{tbl.gsub('.', '__')}_#{brick_escape(pk_val)} = #{seed_model.klass.name}.create(#{(fk_vals + data).join(', ')})\n"
      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