display charts correctly even when invalid min/max values are present
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@ -90,6 +90,44 @@ class Channel < ActiveRecord::Base
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cattr_reader :per_page
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@@per_page = 15
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# access a last value by string: channel_1417_field_1
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def self.value_from_string(channel_string, user)
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# remove % from the string and create the array
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channel_array = channel_string.gsub('%', '').split('_')
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# exit if the string doesn't have 4 parts
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return nil if channel_array.length != 4
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# get the channel
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channel = Channel.find(channel_array[1])
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# exit if the channel is not public or not owned by the user
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return nil if !(channel.public_flag? || channel.user_id == user.try(:id))
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# get the field id
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field_id = channel_array[3].to_i
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# get the feed
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begin
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# add a timeout since this query may be really long if there is a lot of data,
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# but the last instance of the field is very far back
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Timeout.timeout(5, Timeout::Error) do
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# look for a feed where the value isn't null
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@feed = Feed.where(:channel_id => channel.id)
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.where("field? is not null", field_id)
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.select("entry_id, field#{field_id}")
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.order('entry_id desc')
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.first
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end
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rescue Timeout::Error
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rescue
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end
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# no feed found
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return nil if @feed.blank?
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# return the feed value
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return @feed["field#{field_id}"]
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end
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# search for public channels within a certain distance from the origin
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# requires latitude, longitude, and distance to be present as options keys
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# distance is in kilometers
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