Merge pull request #3236 from Uninett/bugfix/clean-dashboards-to-one-…

…default

Ensure every account has exactly one default dashboard

changelog.d/+migration-one-default-dashboard.fixed.md

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+Ensure that each account has exactly one default dashboard

python/nav/models/sql/changes/sc.05.12.0001.sql

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+-- This migration is to ensure that for accounts that don't have a default
+-- dashboard we set a default dashboard
+
+-- This part finds the row with the lowest id for any account that does not
+-- have a default dashboard
+WITH CTE AS (
+  SELECT MIN(id) as id
+  FROM account_dashboard a
+  WHERE NOT EXISTS (
+    SELECT 1 
+    FROM account_dashboard b 
+    WHERE a.account_id = b.account_id 
+    AND b.is_default = TRUE
+  )
+  GROUP BY account_id
+)
+-- And this part sets is_default for that row to true
+UPDATE account_dashboard
+SET is_default = TRUE
+WHERE id IN (SELECT id FROM CTE);

python/nav/models/sql/changes/sc.05.12.0002.sql

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+-- This migration is to ensure that for accounts that have more than one
+-- default dashboard we set is_default to false for all except for one
+
+UPDATE account_dashboard
+SET is_default = FALSE
+WHERE id NOT IN (
+  -- This part finds the lowest id of the default dashboards for each
+  -- account_id 
+  SELECT MIN(id)
+  FROM account_dashboard
+  WHERE is_default = TRUE
+  GROUP BY account_id
+)
+AND account_id IN (
+  -- This part finds all account_ids that have more than one default dashboard
+  SELECT account_id
+  FROM account_dashboard
+  WHERE is_default = TRUE
+  GROUP BY account_id
+  HAVING COUNT(account_id) > 1
+)