How does one use a <select> for a habtm field? I''m having trouble
getting it to work.
Here''s my html:
<div>
<p><label
for="projects">Project</label><br/>
<select id="schedule_projects"
name="schedule[project_ids][]"
multiple="multiple" size="10">
<%options_from_collection_for_select(@all_projects, :id, :name,
@selected_projects) %>
</select>
</p>
</div>
And my controller:
def edit
@schedule = Schedule.find(params[:id])
@all_projects = Project.find(:all, :order=>"name")
@selected_projects = @schedule.projects.collect{|prj|
prj.project_id.to_i}
end
def update
@schedule = Schedule.find(params[:id])
if @schedule.update_attributes(params[:schedule])
flash[:notice] = ''Schedule was successfully updated.''
redirect_to :action => ''show'', :id => @schedule
else
render :action => ''edit''
end
end
I keep getting an error:
ActiveRecord::StatementInvalid in ScheduleController#update
Mysql::Error: Duplicate entry ''3'' for key 1: INSERT INTO
projects_schedules (`project_id`, `id`, `schedule_id`) VALUES (3, 3,
1)
It''s because the id 3 is already used in the projects_schedules table.
Why is it choosing a duplicate key?
T.
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