Last commit.HEADmaster

1 files changed, 55 insertions, 0 deletions

diff --git a/app/models/concerns/nutrient_vector.rb b/app/models/concerns/nutrient_vector.rb
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+++ b/app/models/concerns/nutrient_vector.rb
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+module NutrientVector
+  extend ActiveSupport::Concern
+
+  NUTRIENT_KEYS = %i[
+    nno3 p k ca mg s na cl si fe zn b mn cu mo nnh4
+  ].freeze
+
+  included do
+    # Define simple readers (nno3, p, k, ...) that read from #nutrient_values
+    NUTRIENT_KEYS.each do |k|
+      define_method(k) { nutrient_values[k] }
+    end
+  end
+
+  # Hash-like access
+  def [](key)
+    key = key.to_sym
+    return nil unless NUTRIENT_KEYS.include?(key)
+    public_send(key)
+  end
+
+  def keys = NUTRIENT_KEYS
+
+  # Returns a copy to avoid accidental mutation
+  def to_h
+    NUTRIENT_KEYS.index_with { |k| public_send(k) }
+  end
+
+  # Iterate over pairs
+  def each_pair
+    return enum_for(:each_pair) unless block_given?
+    NUTRIENT_KEYS.each { |k| yield k, public_send(k) }
+  end
+
+  # Simple difference (self - other), useful for “how far from target?”
+  def delta_against(other)
+    NUTRIENT_KEYS.index_with { |k| (public_send(k).to_f) - (other.public_send(k).to_f) }
+  end
+
+  # Percent difference relative to other (e.g., measurement vs target)
+  # Returns 0 when both are 0, and nil when target is 0 but measurement isn’t.
+  def percent_diff_against(other)
+    NUTRIENT_KEYS.index_with do |k|
+      a = public_send(k).to_f
+      b = other.public_send(k).to_f
+      if b.zero? && a.zero?
+        0.0
+      elsif b.zero?
+        nil
+      else
+        ((a - b) / b) * 100.0
+      end
+    end
+  end
+end