Merge pull request #330 from MetRonnie/db-diagram

Minor correction to DB diagram

Author: hjoliver

README.md

@@ -82,6 +82,10 @@ We use a few custom Sphinx extensions, for details see
 [![test](https://github.com/cylc/cylc-doc/workflows/test/badge.svg?branch=master&event=push)](https://github.com/cylc/cylc-doc/actions?query=workflow%3Atest)
 [![nightly](https://github.com/cylc/cylc-doc/workflows/nightly/badge.svg)](https://github.com/cylc/cylc-doc/actions?query=workflow%3Anightly)
 
+### Installation
+
+Note: you may need to install `graphviz` first (e.g. `conda install graphviz`).
+
 ```console
 $ git clone [email protected]:cylc/cylc-doc.git cylc-doc
 $ cd cylc-doc
@@ -136,14 +140,14 @@ allows it to pick up changes to autodocumented items in the source code.
 > i.e. `pip install -e <repo>` for this to work.
 > **Note:** This might not work for all filesystems.
 
-## Testing
+### Testing
 
 ```console
 # note: -W tells Sphinx to fail on warnings
 $ make html linkcheck doctest SPHINXOPTS='-W'
 ```
 
-## Deploying
+### Deploying
 
 **To document a new version of Cylc:**
 
@@ -180,7 +184,7 @@ $ make html linkcheck doctest SPHINXOPTS='-W'
   This has not been automated on-purpose, though if it becomes a problem
   we could potentially setup a chron job to squash all but the last N commits.
 
-## Nightly Builds
+### Nightly Builds
 
 The `nightly` action builds `cylc-doc:master` against `cylc-flow:master`
 and pushes the result up to `upstream/gh-pages`.

src/ext/database_diagram.py

@@ -56,6 +56,8 @@ def get_relationships():
          CylcWorkflowDAO.TABLE_TASK_LATE_FLAGS],
         [CylcWorkflowDAO.TABLE_TASK_POOL, ONE_TO_MANY,
          CylcWorkflowDAO.TABLE_TASK_OUTPUTS],
+        [CylcWorkflowDAO.TABLE_TASK_POOL, ONE_TO_MANY,
+         CylcWorkflowDAO.TABLE_TASK_PREREQUISITES],
         [CylcWorkflowDAO.TABLE_TASK_POOL, ONE_TO_ONE,
          CylcWorkflowDAO.TABLE_TASK_TIMEOUT_TIMERS]
     ]

src/release-note.rst

@@ -1,6 +1,6 @@
 .. note::
 
-   Cylc |release| is the final *beta* pre-release of Cylc 8. It is largely
+   Cylc |release| is a Cylc 8 *release candidate*. It is largely
    complete and can be used to manage real workflows, but it has not yet been
    heavily tested by users. Python 2 based Cylc 7 is stable and still available
    if needed for production systems.