Class: Databasium::Migration

Inherits:
Object
  • Object
show all
Defined in:
app/services/databasium/migration.rb

Constant Summary collapse

MIGRATIONS_PATHS = 
[ "db/migrate" ]
MIGRATIONS_TEMPLATE_PATH = 
Databasium::Engine.root.join("lib/databasium/templates/migration.rb.tt")
CREATE_TABLE_MIGRATIONS_TEMPLATE_PATH = 
Databasium::Engine.root.join("lib/databasium/templates/create_table_migration.rb.tt")

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Migration

Returns a new instance of Migration.



9
10
11
12
13
 
# File 'app/services/databasium/migration.rb', line 9

def initialize
  @migration_context = ActiveRecord::MigrationContext.new(MIGRATIONS_PATHS)
  @migrations = @migration_context.migrations
  @pending_migrations = @migration_context.pending_migration_versions
end

Instance Attribute Details

#migration_context ⇒ Object (readonly)

Returns the value of attribute migration_context.



2
3
4
 
# File 'app/services/databasium/migration.rb', line 2

def migration_context
  @migration_context
end

#migrations ⇒ Object (readonly)

Returns the value of attribute migrations.



2
3
4
 
# File 'app/services/databasium/migration.rb', line 2

def migrations
  @migrations
end

#pending_migrations ⇒ Object (readonly)

Returns the value of attribute pending_migrations.



2
3
4
 
# File 'app/services/databasium/migration.rb', line 2

def pending_migrations
  @pending_migrations
end

Instance Method Details

#find_migration!(version) ⇒ Object 



20
21
22
23
24
25
26
 
# File 'app/services/databasium/migration.rb', line 20

def find_migration!(version)
  migration = migration_context.migrations.find { |m| m.version.to_s == version.to_s }
  unless migration && File.file?(migration.filename)
    raise ActiveRecord::RecordNotFound, "Migration #{version} not found"
  end
  migration
end

#generate_migration(params) ⇒ Object 



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
 
# File 'app/services/databasium/migration.rb', line 74

def generate_migration(params)
  unless params[:table_name_from].present? || params[:table_name_to].present? ||
           params[:table_name].present?
    raise "Please provide a table name to generate a migration"
  end

  require "rails/generators/active_record/migration/migration_generator"
  require "rails/generators"
  Rails.application.load_generators
  args = build_generator_args(params)
  gen =
    ActiveRecord::Generators::MigrationGenerator.new(
      args,
      {},
      behavior: :invoke,
      destination_root: Rails.root.to_s
    )

  gen.send(:set_local_assigns!)
  gen.set_migration_assigns!(gen.file_name)

  if params[:migration_action] == "create"
    source = CREATE_TABLE_MIGRATIONS_TEMPLATE_PATH
  else
    source = MIGRATIONS_TEMPLATE_PATH
  end
  ERB.new(File.read(source), trim_mode: "-", eoutvar: "@output_buffer").result(
    gen.instance_eval("binding")
  )
end

#get_migrations(search) ⇒ Object 



15
16
17
18
 
# File 'app/services/databasium/migration.rb', line 15

def get_migrations(search)
  return @migrations unless search.present?
  @migrations.select { |m| m.name =~ /#{Regexp.escape(search)}/i } if search
end

#rollback_migration(version, rollback_steps, till_this_migration) ⇒ Object 



38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'app/services/databasium/migration.rb', line 38

def rollback_migration(version, rollback_steps, till_this_migration)
  begin
    if rollback_steps.present?
      migration_context.rollback(rollback_steps.to_i)
    elsif till_this_migration == "true"
      migration_context.down(version.to_i)
    else
      migration_context.run(:down, version.to_i)
    end
  rescue => e
    raise "There was an error rolling back the #{version} migration: #{e.message}"
  end
end

#run_migration(version) ⇒ Object 



52
53
54
55
56
57
58
 
# File 'app/services/databasium/migration.rb', line 52

def run_migration(version)
  begin
    migration_context.run(:up, version.to_i)
  rescue => e
    raise "There was an error running the #{version} migration: #{e.message}"
  end
end

#run_pending_migrations ⇒ Object 



28
29
30
31
32
33
34
35
36
 
# File 'app/services/databasium/migration.rb', line 28

def run_pending_migrations
  versions = migration_context.pending_migration_versions
  begin
    versions.each { |version| migration_context.run(:up, version) }
  rescue => e
    raise "There was an error running the pending migrations: #{e.message}"
  end
  versions
end

#save_migration(params) ⇒ Object 



60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'app/services/databasium/migration.rb', line 60

def save_migration(params)
  require "rails/generators/active_record/migration/migration_generator"
  require "rails/generators"
  Rails.application.load_generators
  args = build_generator_args(params)
  if params[:add_migration] == "Save" && params[:add_model] == "1"
    generator = "model"
  else
    generator = "migration"
  end
  Rails::Generators.invoke(generator, args, behavior: :invoke, destination_root: Rails.root.to_s)
  true
end