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1 | package DBIx::Class::DeploymentHandler::Dad; |
2 | |
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3 | # ABSTRACT: Parent class for DeploymentHandlers |
4 | |
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5 | use Moose; |
6 | use Method::Signatures::Simple; |
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7 | require DBIx::Class::Schema; # loaded for type constraint |
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8 | use Carp::Clan '^DBIx::Class::DeploymentHandler'; |
9 | |
10 | has schema => ( |
11 | isa => 'DBIx::Class::Schema', |
12 | is => 'ro', |
13 | required => 1, |
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14 | ); |
15 | |
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16 | has backup_directory => ( |
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17 | isa => 'Str', |
18 | is => 'ro', |
19 | predicate => 'has_backup_directory', |
20 | ); |
21 | |
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22 | has to_version => ( |
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23 | is => 'ro', |
24 | lazy_build => 1, |
25 | ); |
26 | |
27 | sub _build_to_version { $_[0]->schema->schema_version } |
28 | |
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29 | has schema_version => ( |
30 | is => 'ro', |
31 | lazy_build => 1, |
32 | ); |
33 | |
34 | sub _build_schema_version { $_[0]->schema->schema_version } |
35 | |
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36 | method install { |
37 | croak 'Install not possible as versions table already exists in database' |
38 | if $self->version_storage_is_installed; |
39 | |
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40 | my $ddl = $self->deploy; |
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41 | |
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42 | $self->add_database_version({ |
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43 | version => $self->to_version, |
44 | ddl => $ddl, |
45 | }); |
46 | } |
47 | |
48 | sub upgrade { |
49 | my $self = shift; |
50 | while ( my $version_list = $self->next_version_set ) { |
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51 | my ($ddl, $upgrade_sql) = @{$self->upgrade_single_step($version_list)||[]}; |
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52 | |
53 | $self->add_database_version({ |
54 | version => $version_list->[-1], |
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55 | ddl => $ddl, |
56 | upgrade_sql => $upgrade_sql, |
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57 | }); |
58 | } |
59 | } |
60 | |
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61 | sub downgrade { |
62 | my $self = shift; |
63 | while ( my $version_list = $self->previous_version_set ) { |
64 | $self->downgrade_single_step($version_list); |
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65 | |
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66 | # do we just delete a row here? I think so but not sure |
67 | $self->delete_database_version({ version => $version_list->[-1] }); |
68 | } |
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69 | } |
70 | |
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71 | method backup { $self->storage->backup($self->backup_directory) } |
72 | |
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73 | __PACKAGE__->meta->make_immutable; |
74 | |
75 | 1; |
76 | |
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77 | # vim: ts=2 sw=2 expandtab |
78 | |
79 | __END__ |
80 | |
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81 | =pod |
82 | |
83 | =attr schema |
84 | |
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85 | The L<DBIx::Class::Schema> (B<required>) that is used to talk to the database |
86 | and generate the DDL. |
87 | |
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88 | =attr backup_directory |
89 | |
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90 | The directory where backups are stored |
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91 | |
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92 | =attr to_version |
93 | |
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94 | The version (defaults to schema's version) to migrate the database to |
95 | |
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96 | =method install |
97 | |
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98 | $dh->install |
99 | |
100 | Deploys the current schema into the database. Populates C<version_storage> with |
101 | C<version> and C<ddl>. |
102 | |
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103 | B<Note>: you typically need to call C<< $dh->prepare_deploy >> before you call |
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104 | this method. |
105 | |
106 | B<Note>: you cannot install on top of an already installed database |
107 | |
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108 | =method upgrade |
109 | |
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110 | $dh->upgrade |
111 | |
112 | Upgrades the database one step at a time till L</next_version_set> |
113 | returns C<undef>. Each upgrade step will add a C<version>, C<ddl>, and |
114 | C<upgrade_sql> to the version storage (if C<ddl> and/or C<upgrade_sql> are |
115 | returned from L</upgrade_single_step>. |
116 | |
117 | =method downgrade |
118 | |
119 | $dh->downgrade |
120 | |
121 | Downgrades the database one step at a time till L</previous_version_set> |
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122 | returns C<undef>. Each downgrade step will delete a C<version> from the |
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123 | version storage. |
124 | |
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125 | =method backup |
126 | |
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127 | $dh->backup |
128 | |
129 | Simply calls backup on the C<< $schema->storage >>, passing in |
130 | C<< $self->backup_directory >> as an argument. Please test yourself before |
131 | assuming it will work. |
132 | |
133 | =head1 METHODS THAT ARE REQUIRED IN SUBCLASSES |
134 | |
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135 | =head2 deploy |
136 | |
137 | See L<DBIx::Class::DeploymentHandler::HandlesDeploy/deploy>. |
138 | |
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139 | =head2 version_storage_is_installed |
140 | |
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141 | See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/version_storage_is_installed>. |
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142 | |
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143 | =head2 add_database_version |
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144 | |
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145 | See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/add_database_version>. |
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146 | |
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147 | =head2 delete_database_version |
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148 | |
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149 | See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/delete_database_version>. |
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150 | |
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151 | =head2 next_version_set |
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152 | |
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153 | See L<DBIx::Class::DeploymentHandler::HandlesVersioning/next_version_set>. |
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154 | |
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155 | =head2 previous_version_set |
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156 | |
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157 | See L<DBIx::Class::DeploymentHandler::HandlesVersioning/previous_version_set>. |
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158 | |
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159 | =head2 upgrade_single_step |
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160 | |
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161 | See L<DBIx::Class::DeploymentHandler::HandlesDeploy/upgrade_single_step>. |
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162 | |
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163 | =head2 downgrade_single_step |
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164 | |
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165 | See L<DBIx::Class::DeploymentHandler::HandlesDeploy/downgrade_single_step>. |
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166 | |
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167 | =head1 ORTHODOX METHODS |
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168 | |
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169 | These methods are not actually B<required> as things will probably still work |
170 | if you don't implement them, but if you want your subclass to get along with |
171 | other subclasses (or more likely, tools made to use another subclass), you |
172 | should probably implement these too, even if they are no-ops. |
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173 | |
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174 | =head2 database_version |
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175 | |
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176 | see L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/database_version> |
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177 | |
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178 | =head2 prepare_deploy |
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179 | |
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180 | see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_deploy> |
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181 | |
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182 | =head2 prepare_resultsource_install |
183 | |
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184 | see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_resultsource_install> |
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185 | |
186 | =head2 install_resultsource |
187 | |
188 | see L<DBIx::Class::DeploymentHandler::HandlesDeploy/install_resultsource> |
189 | |
190 | =head2 prepare_upgrade |
191 | |
192 | see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_upgrade> |
193 | |
194 | =head2 prepare_downgrade |
195 | |
196 | see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_downgrade> |
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197 | |
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198 | =head2 SUBCLASSING |
199 | |
200 | All of the methods mentioned in L</METHODS THAT ARE REQUIRED IN SUBCLASSES> and |
201 | L</ORTHODOX METHODS> can be implemented in any fashion you choose. In the |
202 | spirit of code reuse I have used roles to implement them in my two subclasses, |
203 | L<DBIx::Class::DeploymentHandler> and |
204 | L<DBIx::Class::DeploymentHandler::Deprecated>, but you are free to implement |
205 | them entirely in a subclass if you so choose to. |
206 | |
207 | For in-depth documentation on how methods are supposed to work, see the roles |
208 | L<DBIx::Class::DeploymentHandler::HandlesDeploy>, |
209 | L<DBIx::Class::DeploymentHandler::HandlesVersioning>, and |
210 | L<DBIx::Class::DeploymentHandler::HandlesVersionStorage>. |
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211 | |