lib/table.rb in table_pal-0.1.0 vs lib/table.rb in table_pal-0.2.0

@@ -8,26 +8,34 @@
       @columns = []
       @cells   = []
     end
 
     def create_row(options = {})
+      Validate.new(__method__, options)
+
       Row.new(options.merge(table: self)).tap do |row|
         @rows << row
       end
     end
 
     def create_underline
       Row.new(table: self).cells_as_underline
     end
 
     def create_column(options = {})
+      Validate.new(__method__, options)
+
       Column.new(options.merge(table: self)).tap do |column|
         @columns << column
       end
     end
 
     def create_cell(options = {})
+      Validate.new(__method__, options)
+
+      ensure_cell_does_not_exist(options.slice(:row, :column))
+
       Cell.new(options).tap do |cell|
         @cells << cell
       end
     end
 
@@ -35,9 +43,17 @@
       cells.find { |cell| cell.row == row && cell.column == column }
     end
 
     def select_cells(column:)
       cells.select { |cell| cell.column == column }
+    end
+
+    def ensure_cell_does_not_exist(row:, column:)
+      cell = find_cell(row: row, column: column)
+
+      return unless cell
+
+      raise TablePalError, "Cell with content: '#{cell.content}' already exists at this row and column."
     end
 
   end
 end