Setting mapping's range option for inserted groups

[ERussel]

Hello,

I want to display messages in the UITableView grouped by users. And i want to show only first message for particular user. I use YapDatabaseViewMapping with initWithGroupFilterBlock:sortBlock:view init method and i want to set fixed range options for inserted groups. How can i achieve this goal? I can't do this before groups inserts because i don't know user's id beforehand.

I tried to do this in filter block of the initWithGroupFilterBlock:sortBlock:view method. But it seems doesn't work. My app just freezes.

[nevsi]

Hi, is Setting mapping's range option for inserted groups possible then? I tried it, no freeze of the UI as described by others, but it does not seem to have any effect...?

[robbiehanson]

It looks like a similar problem was solved for mappings.isDynamicSection. With that particular property, one can configure a default setting for the property that will apply to any group that isn't explicitly configured otherwise. This design should probably be expanded for rangeOptions, cellDrawingDependencies & isReversed.

[nevsi]

@robbiehanson thank you for your reply! Would you mind pointing to an example with mappings.isDynamicSection where this problem was solved. Thanks

[robbiehanson]

I meant that the API for isDynamicSection is more flexible than for other options:

• (void)setIsDynamicSection:(BOOL)isDynamic forGroup:(NSString *)group;
• (BOOL)isDynamicSectionForGroup:(NSString *)group;
• (void)setIsDynamicSectionForAllGroups:(BOOL)isDynamic;
• (BOOL)isDynamicSectionForAllGroups;

Vs:

• (void)setRangeOptions:(YapDatabaseViewRangeOptions *)rangeOpts forGroup:(NSString *)group;
• (YapDatabaseViewRangeOptions *)rangeOptionsForGroup:(NSString *)group;

There are 2 ways one can create a mappings instance:

• with a fixed set of groups via initWithGroups:view:
• with a dynamic set of groups via initWithGroupFilterBlock:sortBlock:view:

Setting group options (such as rangeOptions) for a non-existent group is allowed if (and only if) mappings was created using a dynamic set of groups.

I think, in general, it needs to be easier to set options for groups that don't exist (yet). And it needs to be easier to add/remove groups from mappings.