MySQL JOIN returning unrelated rows when combined with LEFT JOIN, WHERE and OR -

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i have following table structure. idea users have permissions forum either class or specific user overrides. ('action' in both cases enum values 'read' & 'write')

user (id, class) forum (id, name) forum_permissions (forum_id, class_id, action) forum_user_permissions (forum_id, user_id, action)

with following query, i'm getting results based on rows in forum_permissions don't expect. mean every row on forum_permissions forum_id = 3 returned though class_id not match.

select      forum.id forum_id, forum.name        forum join        forum_permissions on forum_permissions.forum_id = forum.id left join   forum_user_permissions on (               forum_user_permissions.forum_id = forum.id , forum_user_permissions.user_id = 3 )       (( forum_permissions.class_id = 1 , forum_permissions.action = 'read' )               or              ( forum_user_permissions.action = 'read' ))

e.g. this:

forum_id    name    1        chat    2        support    3        secret    3        secret    3        secret    3        secret

but expected this:

forum_id    name    1        chat    2        support    3        secret

i have made sql fiddle specific example including data http://sqlfiddle.com/#!2/75c3a/5/0

your left join adding lines. mybe if change where 

where  forum_user_permissions.user_id not null , (   (forum_permissions.class_id = 1 , forum_permissions.action = 'read') or   (forum_user_permissions.action = 'read') )

or

select  forum.id forum_id, forum.name  forum join  forum_permissions    on     forum_permissions.forum_id = forum.id left join  forum_user_permissions   on (     forum_user_permissions.forum_id = forum.id    ) forum_user_permissions.user_id = 3 , (  (forum_permissions.class_id = 1 , forum_permissions.action = 'read')  or  (forum_user_permissions.action = 'read')  )

but depends on results trying get


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