Alzabo::ForeignKey - Foreign key (relation) objects

       Dave Rolsky, <autarch@urth.org>

perl v5.34.0                                       2022-06-14                            Alzabo::ForeignKey(3pm)

       A foreign key is an object defined by several properties.  It represents a relationship from a column or
       columns in one table to a column or columns in another table.

       This relationship is defined by its cardinality (one to one, one to many, or many to one) and its
       dependencies (whether or not table X is dependent on table Y, and vice versa).

       Many to many relationships are not allowed.  However, you may indicate such a relationship when using the
       Alzabo::Create::Schema->add_relation method method, and it will create the necessary intermediate linking
       table for you.

table_fromtable_to
       Returns the relevant "Alzabo::Table" object.

   columns_fromcolumns_to
       Returns the relevant "Alzabo::Column" object(s) for the property as an array.

   column_pairs
       Returns an array of array references.  The references are to two column array of "Alzabo::Column"
       objects.  These two columns correspond in the tables being linked together.

   cardinality
       Returns a two element array containing the two portions of the cardinality of the relationship.  Each
       portion will be either '1' or 'n'.

   from_is_dependentto_is_dependent
       Returns a boolean value indicating whether there is a dependency from one table to the other.

   is_one_to_oneis_one_to_manyis_many_to_one
       Returns a boolean value indicating what kind of relationship the object represents.

   is_same_relationship_as($fk)
       Given a foreign key object, this returns true if the two objects represent the same relationship.
       However, the two objects may represent the same relationship from different table's points of view.

   id
       Returns a string uniquely identifying the foreign key.

   comment
       Returns the comment associated with the foreign key object, if any.

       Alzabo::ForeignKey - Foreign key (relation) objects

         use Alzabo::ForeignKey;

         foreach my $fk ($table->foreign_keys)
         {
             print $fk->cardinality;
         }