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Patch for "19.10_STABLE" branch: https://reviews.mahara.org/10580

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https://bugs.launchpad.net/bugs/1829943

Title:
  Error deleting institution due to foreign key constraint with view
  table

Status in Mahara:
  In Progress
Status in Mahara 19.04 series:
  Confirmed
Status in Mahara 19.10 series:
  In Progress
Status in Mahara 20.04 series:
  In Progress

Bug description:
  Mahara: 19.04.0
  OS: Linux
  DB: Postgres
  Browser: FF

  We have an institution which no longer has any users. When trying to
  delete it, it fails due to the foreign key constraint with the view
  table - which now has the institution field.


  Call stack (most recent first):

      log_message("Array to string conversion", 8, true, true, "/var/www/mahara/htdocs/lib/adodb/adodb...", 45) at /var/www/mahara/htdocs/lib/errors.php:520
      error(8, "Array to string conversion", "/var/www/mahara/htdocs/lib/adodb/adodb...", 45, array(size 7)) at /var/www/mahara/htdocs/lib/adodb/adodb-exceptions.inc.php:45
      ADODB_Exception->__construct("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "host" violates ...", "DELETE FROM "host" WHERE "institution" = ? ", array(size 1), object(ADODB_postgres8)) at /var/www/mahara/htdocs/lib/adodb/adodb-exceptions.inc.php:80
      adodb_throw("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "host" violates ...", "DELETE FROM "host" WHERE "institution" = ? ", array(size 1), object(ADODB_postgres8)) at /var/www/mahara/htdocs/lib/adodb/adodb.inc.php:310
      ADODB_TransMonitor("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "host" violates ...", "DELETE FROM "host" WHERE "institution" = ? ", array(size 1), object(ADODB_postgres8)) at /var/www/mahara/htdocs/lib/adodb/adodb.inc.php:1281
      ADOConnection->_Execute("DELETE FROM "host" WHERE "institution" = ? ", array(size 1)) at /var/www/mahara/htdocs/lib/adodb/adodb.inc.php:1241
      ADOConnection->Execute("DELETE FROM "host" WHERE "institution" = ? ", array(size 1)) at /var/www/mahara/htdocs/lib/dml.php:981
      delete_records("host", "institution", "mytest") at /var/www/mahara/htdocs/admin/users/institutions.php:175
      delete_submit(object(Pieform), array(size 4)) at /var/www/mahara/htdocs/lib/pieforms/pieform.php:544
      Pieform->__construct(array(size 2)) at /var/www/clients/htdocs/lib/pieforms/pieform.php:166
      Pieform::process(array(size 2)) at /var/www/clients/htdocs/lib/mahara.php:5379
      pieform(array(size 2)) at /var/www/mahara/htdocs/admin/users/institutions.php:217

  [WAR] 55 (lib/errors.php:858) Failed to get a recordset: postgres8 error: [-1: ERROR:  update or delete on table "host" violates foreign key constraint "view_sub2_fk" on table "view"
  DETAIL:  Key (wwwroot)=(https://mytest.com.au) is still referenced from table "view".] in adodb_throw(DELETE FROM "host"  WHERE "institution" = ? , Array)Command was: DELETE FROM "host"  WHERE "institution" = ?  and values was (0:mytest)


  There are records in the view table that have submitted pages to this
  institution. It's setup with XML-RPC with a Moodle.

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