I'm trying to add a foreign key of the customer in my table in InstallSchema file :

                ->addColumn($installer->getTable('fmj_crf/projet'), 'customer_fk_id', Table::TYPE_INTEGER, null, array(
                    'unsigned' => true,
                    'nullable' => false,
                        ), 'customer Id');

                $installer->getFkName('fmj_crf/projet', 'customer_fk_id', 'customer_entity', 'entity_id'), $installer->getTable('fmj_crf/projet'), 'customer_fk_id', $installer->getTable('customer_entity'), 'entity_id'

but when I upgrade it gives me this error :

  SQLSTATE[HY000]: General error: 1825 Failed to add the foreign key constraint on table 'fmj_crf/projet'.   

Anyone can help ?

  • whats your custom table name? – Rakesh Jesadiya Oct 10 '17 at 12:04
  • the name is fmj_crf/projet – Ayoub El Hayat Oct 10 '17 at 12:05
  • Are you using upgrade schema or Install Schema. In your question you have mentioned use of InstallSchema and In below you have written when upgrade gives you error. Clarify it. – Priyank Oct 10 '17 at 12:39
  • I'm using InstallSchema , and after I run the command setup:upgrade to enable my module I had the error I mentioned. – Ayoub El Hayat Oct 10 '17 at 12:49

I found a solution by changing the definition to the foreign key column in the upgradeSchema file like this :

                    'fmj_crf/projet', 'customer_fk_id', 'customer_fk_id', ['type' => Table::TYPE_INTEGER, 'unsigned' => true, 'nullable' => false, 'primary' => true,]

and then :

                            'fmj_crf/projet', 'customer_fk_id', 'customer_entity', 'entity_id'
                    ), $setup->getTable('fmj_crf/projet'), 'customer_fk_id', $setup->getTable('customer_entity'), 'entity_id', \Magento\Framework\DB\Ddl\Table::ACTION_CASCADE
                    'your_custom_table_name',                   // priTableName
                    'your_custom_table_field',                  // priColumnName
                    'customer_entity',                          // refTableName
                    'entity_id'                                 // refColumnName
                'your_custom_table_field',                      // column
                'entity_id',                                    // refColumn
                \Magento\Framework\DB\Ddl\Table::ACTION_CASCADE // onDelete

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