MishkaCmsCore.
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Writes an error page's path from the site it belongs to, on every action that can set one.
MishkaCmsCore.Runtime.ErrorAddress holds the rule and says why there is one: the renderer
derives the address it looks a row up by, so a path anybody typed was a path that had to match a
string in another module by luck, and one that did not produce an error page nothing could ever
render.
Why the action and not the form
Because there are five ways a row arrives — the Gervaz form, the builder's essentials step, the
JSON:API, a seed and a restore — and the form is one of them. The same reason
MishkaCmsCore.Runtime.Resources.Changes.SignCode lives here.
On update as well as create
A site can be renamed, and every error page under it would quietly stop resolving. Forcing the
address on update means the next save of an affected row repairs it, which is the only repair
anybody would think to try. It cannot fight the author over the field either: update accepts no
site_id, so the site this derives from is the one already on the record.
Where the site id comes from
Whichever half the action has. A tenant create is given the site as the tenant, a master create as
an attribute, an update by the record it loaded. Nothing is derived when none of them answers —
the action's own present and TenantContext validations are what refuse that, and this change
refusing it too would be a second message for one mistake.