[migration] fix add_relation_type() for symmetric relations
To check if the corresponding SQL table has to created, CWRelationAddOp
tests that the tablename is not in the 'createdtables' session variable
(i.e. the table hasn't been created before in the same transaction) and
that len(rschema.rdefs) is not greater to 1, that is the relation already
existed in the database before this transaction.
In case of symmetric relations, len(rschema).rdefs will be at least 2
since rdefs will store both (subj, obj) and (obj, subj) relation
definitions.
=========================================
Refactoring the CSSs with UI properties
=========================================
Overview
=========
Managing styles progressively became difficult in CubicWeb. The
introduction of uiprops is an attempt to fix this problem.
The goal is to make it possible to use variables in our CSSs.
These variables are defined or computed in the uiprops.py python file
and inserted in the CSS using the Python string interpolation syntax.
A quick example, put in ``uiprops.py``::
defaultBgColor = '#eee'
and in your css::
body { background-color: %(defaultBgColor)s; }
The good practices are:
- define a variable in uiprops to avoid repetitions in the CSS
(colors, borders, fonts, etc.)
- define a variable in uiprops when you need to compute values
(compute a color palette, etc.)
The algorithm implemented in CubicWeb is the following:
- read uiprops file while walk up the chain of cube dependencies: if
cube myblog depends on cube comment, the variables defined in myblog
will have precedence over the ones in comment
- replace the %(varname)s in all the CSSs of all the cubes
Keep in mind that the browser will then interpret the CSSs and apply
the standard cascading mechanism.
FAQ
====
- How do I keep the old style?
Put ``STYLESHEET = [data('cubicweb.old.css')]`` in your uiprops.py
file and think about something else.
- What are the changes in cubicweb.css?
Version 3.9.0 of cubicweb changed the following in the default html
markup and css:
=============== ==================================
old new
=============== ==================================
.navcol #navColumnLeft, #navColumnRight
#contentcol #contentColumn
.footer #footer
.logo #logo
.simpleMessage .loginMessage
.appMsg (styles are removed from css)
.searchMessage (styles are removed from css)
=============== ==================================
Introduction of the new cubicweb.reset.css based on Eric Meyer's
reset css.
Lots of margin, padding, etc.