X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FRelationship.pm;h=e1bed805c0ab775df276facb02dc2589ffbdbec4;hb=90489c23e598723752c9e0d4b4da214ad05e3feb;hp=e3b812b78020f45febdbf80f4e4f2c0d00a81b52;hpb=d4daee7b54e38e4b3d3d0a77759bddc1a4ede6e5;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Relationship.pm b/lib/DBIx/Class/Relationship.pm
index e3b812b..e1bed80 100644
--- a/lib/DBIx/Class/Relationship.pm
+++ b/lib/DBIx/Class/Relationship.pm
@@ -232,13 +232,13 @@ which can be assigned to relationships as well.
 
 =back
 
-Creates a one-to-many relationship, where the corresponding elements
-of the foreign class store the calling class's primary key in one (or
-more) of the foreign class columns. This relationship defaults to using
-the end of this classes namespace as the foreign key in C<$related_class>
-to resolve the join, unless C<$their_fk_column> specifies the foreign
-key column in C<$related_class> or C<cond> specifies a reference to a
-join condition hash.
+Creates a one-to-many relationship where the foreign class refers to
+this class's primary key. This relationship refers to zero or more
+records in the foreign table (ie, a C<LEFT JOIN>). This relationship 
+defaults to using the end of this classes namespace as the foreign key
+in C<$related_class> to resolve the join, unless C<$their_fk_column>
+specifies the foreign key column in C<$related_class> or C<cond>
+specifies a reference to a join condition hash.
 
 =over
 
@@ -441,6 +441,17 @@ methods and valid relationship attributes. Also see L<DBIx::Class::ResultSet>
 for a L<list of standard resultset attributes|DBIx::Class::ResultSet/ATTRIBUTES>
 which can be assigned to relationships as well.
 
+Note that if you supply a condition on which to join, if the column in the
+current table allows nulls (i.e., has the C<is_nullable> attribute set to a
+true value), than C<might_have> will warn about this because it's naughty and
+you shouldn't do that.  
+
+ "might_have/has_one" must not be on columns with is_nullable set to true (MySchema::SomeClass/key)
+
+If you must be naughty, you can suppress the warning by setting
+C<DBIC_DONT_VALIDATE_RELS> environment variable to a true value.  Otherwise,
+you probably just want to use C<DBIx::Class::Relationship/belongs_to>.
+
 =head2 has_one
 
 =over 4
@@ -528,6 +539,11 @@ methods and valid relationship attributes. Also see L<DBIx::Class::ResultSet>
 for a L<list of standard resultset attributes|DBIx::Class::ResultSet/ATTRIBUTES>
 which can be assigned to relationships as well.
 
+Note that if you supply a condition on which to join, if the column in the
+current table allows nulls (i.e., has the C<is_nullable> attribute set to a
+true value), than warnings might apply just as with
+L<DBIx::Class::Relationship/might_have>.
+
 =head2 many_to_many
 
 =over 4