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1 | package # hide from PAUSE |
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2 | SQL::Translator::Parser::DBIx::Class; |
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3 | |
4 | # AUTHOR: Jess Robinson |
5 | |
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6 | # Some mistakes the fault of Matt S Trout |
7 | |
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8 | # Others the fault of Ash Berlin |
9 | |
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10 | use strict; |
11 | use warnings; |
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12 | use vars qw($DEBUG @EXPORT_OK); |
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13 | $DEBUG = 0 unless defined $DEBUG; |
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14 | |
15 | use Exporter; |
16 | use Data::Dumper; |
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17 | use Digest::SHA1 qw( sha1_hex ); |
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18 | use SQL::Translator::Utils qw(debug normalize_name); |
19 | |
20 | use base qw(Exporter); |
21 | |
22 | @EXPORT_OK = qw(parse); |
23 | |
24 | # ------------------------------------------------------------------- |
25 | # parse($tr, $data) |
26 | # |
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27 | # Note that $data, in the case of this parser, is not useful. |
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28 | # We're working with DBIx::Class Schemas, not data streams. |
29 | # ------------------------------------------------------------------- |
30 | sub parse { |
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31 | my ($tr, $data) = @_; |
32 | my $args = $tr->parser_args; |
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33 | my $dbicschema = $args->{'DBIx::Class::Schema'} || $args->{"DBIx::Schema"} ||$data; |
34 | $dbicschema ||= $args->{'package'}; |
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35 | my $limit_sources = $args->{'sources'}; |
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36 | |
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37 | die 'No DBIx::Class::Schema' unless ($dbicschema); |
38 | if (!ref $dbicschema) { |
39 | eval "use $dbicschema;"; |
40 | die "Can't load $dbicschema ($@)" if($@); |
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41 | } |
42 | |
43 | my $schema = $tr->schema; |
44 | my $table_no = 0; |
45 | |
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46 | $schema->name( ref($dbicschema) . " v" . ($dbicschema->VERSION || '1.x')) |
47 | unless ($schema->name); |
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48 | |
49 | my %seen_tables; |
50 | |
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51 | my @monikers = sort $dbicschema->sources; |
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52 | if ($limit_sources) { |
53 | my $ref = ref $limit_sources || ''; |
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54 | die "'sources' parameter must be an array or hash ref" unless $ref eq 'ARRAY' || ref eq 'HASH'; |
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55 | |
56 | # limit monikers to those specified in |
57 | my $sources; |
58 | if ($ref eq 'ARRAY') { |
59 | $sources->{$_} = 1 for (@$limit_sources); |
60 | } else { |
61 | $sources = $limit_sources; |
62 | } |
63 | @monikers = grep { $sources->{$_} } @monikers; |
64 | } |
65 | |
66 | |
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67 | foreach my $moniker (sort @monikers) |
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68 | { |
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69 | my $source = $dbicschema->source($moniker); |
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70 | |
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71 | # Its possible to have multiple DBIC source using same table |
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72 | next if $seen_tables{$source->name}++; |
73 | |
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74 | my $table = $schema->add_table( |
75 | name => $source->name, |
76 | type => 'TABLE', |
77 | ) || die $schema->error; |
78 | my $colcount = 0; |
79 | foreach my $col ($source->columns) |
80 | { |
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81 | # assuming column_info in dbic is the same as DBI (?) |
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82 | # data_type is a number, column_type is text? |
83 | my %colinfo = ( |
84 | name => $col, |
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85 | size => 0, |
86 | is_auto_increment => 0, |
87 | is_foreign_key => 0, |
88 | is_nullable => 0, |
89 | %{$source->column_info($col)} |
90 | ); |
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91 | if ($colinfo{is_nullable}) { |
92 | $colinfo{default} = '' unless exists $colinfo{default}; |
93 | } |
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94 | my $f = $table->add_field(%colinfo) || die $table->error; |
95 | } |
96 | $table->primary_key($source->primary_columns); |
97 | |
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98 | my @primary = $source->primary_columns; |
99 | my %unique_constraints = $source->unique_constraints; |
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100 | foreach my $uniq (sort keys %unique_constraints) { |
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101 | if (!$source->compare_relationship_keys($unique_constraints{$uniq}, \@primary)) { |
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102 | $table->add_constraint( |
103 | type => 'unique', |
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104 | name => _create_unique_symbol($uniq), |
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105 | fields => $unique_constraints{$uniq} |
106 | ); |
107 | } |
108 | } |
109 | |
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110 | my @rels = $source->relationships(); |
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111 | |
112 | my %created_FK_rels; |
113 | |
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114 | foreach my $rel (sort @rels) |
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115 | { |
116 | my $rel_info = $source->relationship_info($rel); |
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117 | |
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118 | # Ignore any rel cond that isn't a straight hash |
119 | next unless ref $rel_info->{cond} eq 'HASH'; |
120 | |
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121 | my $othertable = $source->related_source($rel); |
122 | my $rel_table = $othertable->name; |
123 | |
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124 | # Force the order of @cond to match the order of ->add_columns |
125 | my $idx; |
126 | my %other_columns_idx = map {'foreign.'.$_ => ++$idx } $othertable->columns; |
127 | my @cond = sort { $other_columns_idx{$a} cmp $other_columns_idx{$b} } keys(%{$rel_info->{cond}}); |
128 | |
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129 | # Get the key information, mapping off the foreign/self markers |
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130 | my @refkeys = map {/^\w+\.(\w+)$/} @cond; |
131 | my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond; |
132 | |
133 | if($rel_table) |
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134 | { |
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135 | my $reverse_rels = $source->reverse_relationship_info($rel); |
136 | my ($otherrelname, $otherrelationship) = each %{$reverse_rels}; |
137 | |
138 | my $on_delete = ''; |
139 | my $on_update = ''; |
140 | |
141 | if (defined $otherrelationship) { |
142 | $on_delete = $otherrelationship->{'attrs'}->{cascade_delete} ? 'CASCADE' : ''; |
143 | $on_update = $otherrelationship->{'attrs'}->{cascade_copy} ? 'CASCADE' : ''; |
144 | } |
145 | |
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146 | my $is_deferrable = $rel_info->{attrs}{is_deferrable}; |
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147 | |
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148 | # Make sure we dont create the same foreign key constraint twice |
149 | my $key_test = join("\x00", @keys); |
150 | |
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151 | #Decide if this is a foreign key based on whether the self |
152 | #items are our primary columns. |
153 | |
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154 | # If the sets are different, then we assume it's a foreign key from |
155 | # us to another table. |
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156 | # OR: If is_foreign_key_constraint attr is explicity set (or set to false) on the relation |
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157 | next if ( exists $created_FK_rels{$rel_table}->{$key_test} ); |
158 | if ( exists $rel_info->{attrs}{is_foreign_key_constraint}) { |
159 | # not is this attr set to 0 but definitely if set to 1 |
160 | next unless ($rel_info->{attrs}{is_foreign_key_constraint}); |
161 | } else { |
162 | # not if might have |
163 | # next if ($rel_info->{attrs}{accessor} eq 'single' && exists $rel_info->{attrs}{join_type} && uc($rel_info->{attrs}{join_type}) eq 'LEFT'); |
164 | # not sure about this one |
165 | next if $source->compare_relationship_keys(\@keys, \@primary); |
166 | } |
167 | |
168 | $created_FK_rels{$rel_table}->{$key_test} = 1; |
169 | if (scalar(@keys)) { |
170 | $table->add_constraint( |
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171 | type => 'foreign_key', |
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172 | name => _create_unique_symbol($table->name |
173 | . '_fk_' |
174 | . join('_', @keys)), |
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175 | fields => \@keys, |
176 | reference_fields => \@refkeys, |
177 | reference_table => $rel_table, |
178 | on_delete => $on_delete, |
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179 | on_update => $on_update, |
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180 | (defined $is_deferrable ? ( deferrable => $is_deferrable ) : ()), |
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181 | ); |
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182 | |
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183 | my $index = $table->add_index( |
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184 | name => _create_unique_symbol(join('_', @keys)), |
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185 | fields => \@keys, |
186 | type => 'NORMAL', |
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187 | ); |
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188 | } |
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189 | } |
190 | } |
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191 | |
192 | if ($source->result_class->can('sqlt_deploy_hook')) { |
193 | $source->result_class->sqlt_deploy_hook($table); |
194 | } |
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195 | } |
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196 | |
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197 | if ($dbicschema->can('sqlt_deploy_hook')) { |
198 | $dbicschema->sqlt_deploy_hook($schema); |
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199 | } |
200 | |
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201 | return 1; |
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202 | } |
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203 | |
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204 | # TODO - is there a reasonable way to pass configuration? |
205 | # Default of 64 comes from mysql's limit. |
206 | our $MAX_SYMBOL_LENGTH ||= 64; |
207 | our $COLLISION_TAG_LENGTH ||= 8; |
208 | |
209 | # ------------------------------------------------------------------- |
210 | # $resolved_name = _create_unique_symbol($desired_name) |
211 | # |
212 | # If desired_name is really long, it will be truncated in a way that |
213 | # has a high probability of leaving it unique. |
214 | # ------------------------------------------------------------------- |
215 | sub _create_unique_symbol { |
216 | my $desired_name = shift; |
217 | return $desired_name if length $desired_name <= $MAX_SYMBOL_LENGTH; |
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218 | |
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219 | my $truncated_name = substr $desired_name, 0, $MAX_SYMBOL_LENGTH - $COLLISION_TAG_LENGTH - 1; |
220 | |
221 | # Hex isn't the most space-efficient, but it skirts around allowed |
222 | # charset issues |
223 | my $digest = sha1_hex($desired_name); |
224 | my $collision_tag = substr $digest, 0, $COLLISION_TAG_LENGTH; |
225 | |
226 | return $truncated_name |
227 | . '_' |
228 | . $collision_tag; |
229 | } |
230 | |
231 | 1; |