Products.Relations 0.9 Beta 1

Relations allows for the definition of sets of rules for<br />validation, creation and lifetime of Archetypes references.<br />Contained in each ruleset are components that make for the actual rules logic.<br /><br /> Rulesets may be created and edited through the web (TTW).<br /> Components implementing custom behaviour are easily added.<br /><br />Installation<br /><br /> In Plone, click "Add/Remove Products" in the Plone Setup. Then select Relations from the list of available products and click "Install".<br /><br /> Now click "Relations Library" in the Plone Setup portlet on the left to visit the TTW configuration user interface.<br /><br /> Usage<br /><br /> As an example, add a ruleset by clicking "Add Ruleset" in the library. Now choose a reasonable identification. Notice that identifications are required to be unique among rulesets in your portal.<br /><br /> Note: When you create a reference through a ruleset, the<br /> relationship attribute of the reference is set to be the ruleset's id. There's nothing that is different about how you use the<br /> Archetypes Reference API when querying for referenced objects.<br /> (However, references are created and deleted differently; namely through function 'processor.process'.)<br /><br /> The ruleset's title is what is presented to the user in Plone.<br /> Let's choose "Is Child Of" as the title of our ruleset, and<br />"isChildOf" as the identification.<br /><br /> After saving changes, click "Add New Item" and add a cardinality constraint. Enter "Exactly Two" as the title and choose "2" for both the minimum and the maximum number of targets.<br /> <br /> At this point we still need another component so we can actually make use of the "Is Child Of" ruleset. Add a "Portal Type Constraint" and choose "Unrestricted" as its title. Click the "Save" button and then the "Relations" tab that just appeared.<br /> The form says "Edit Relations for Unrestricted", meaning that we can from here add and remove "Is Child Of" references from our<br /> Portal Type Constraint "Unrestricted" to any referenceable portal object.<br /><br /> Through our "Exactly Two" constraint we assert that we have<br />exactly two "parents".

Requirements:	No special requirements
Platforms:	*nix, Linux
Keyword:	Child,  Choose,  Click,  Constraint,  Identification,  Ofquot,  Plone,  Portal,  Quotadd,  Quotexactly,  Quotis,  Quotunrestrictedquot,  Reference,  References,  Relations,  Rules,  Ruleset,  Setup,  Title
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