Fixes leikind#82

Only call group when there actually is a group set in WiceGrid#read relation

This fixes a bug with wrong paginated result set when having a wice_grid with
an include or column with assoc option on a many association. If this is the
case the grid tries to eager load this association (due to the include/references
on the relation). Rails then normally gets the correct page set by performing an
additonal query to get the matching IDs without the eager load, however this
functionality is disabled when there is a group set on the relation. Because
WiceGrid always called group even when there was no group set this behaviour was
always disabled, leading to an incorrect page set.

By only calling group when there actually is a group we fix this problem in most
cases. However, when providing a group to the grid, problems still occur, but so
does providing a group to a relation with eager load in PostgreSQL in Rails
itself already (e.g. `Author.eager_load(:books).group(:id)`). It might be better
to never eager load associations, but instead always preload them and add the
sort/filter conditions using a left_joins (in combination with a distinct to get
each main model only once).

Also return Arel in get_custom_order_reference when custom order is SqlLiteral

Fixes 'Query method called with non-attribute argument(s)' when using Arel.sql
for custom order in combination with Ruby 3. Should already have been fixed when
the deprecation warning was fixed, but apparently it was not.

Fixup c7a9da2

fix for issue leikind#82

gemfiles/rails_5.0.gemfile.lock

@@ -4,7 +4,7 @@ PATH
     wice_grid (4.1.0)
       coffee-rails (> 3.2)
       kaminari (~> 1.1)
-      rails (~> 5.0, < 5.3)
+      rails (>= 5.0, < 7)
 
 GEM
   remote: https://rubygems.org/

gemfiles/rails_5.1.gemfile.lock

@@ -4,7 +4,7 @@ PATH
     wice_grid (4.1.0)
       coffee-rails (> 3.2)
       kaminari (~> 1.1)
-      rails (~> 5.0, < 5.3)
+      rails (>= 5.0, < 7)
 
 GEM
   remote: https://rubygems.org/

gemfiles/rails_5.2.gemfile.lock

@@ -4,7 +4,7 @@ PATH
     wice_grid (4.1.0)
       coffee-rails (> 3.2)
       kaminari (~> 1.1)
-      rails (~> 5.0, < 5.3)
+      rails (>= 5.0, < 7)
 
 GEM
   remote: https://rubygems.org/

lib/wice/columns/column_custom_dropdown.rb

@@ -84,7 +84,7 @@ def generate_conditions(table_alias, opts)   #:nodoc:
         opts = (opts.is_a?(Array) && opts.size == 1) ? opts[0] : opts
 
         column_name =
-            "#{@column_wrapper.alias_or_table_name(table_alias)}.#{@column_wrapper.name}"
+            "#{@column_wrapper.alias_or_table_name(table_alias)}.\"#{@column_wrapper.name}\""
         if opts.is_a?(Array)
           opts_with_special_values, normal_opts = opts.partition { |v| ::Wice::GridTools.special_value(v) }
 

lib/wice_grid.rb

@@ -375,8 +375,8 @@ def read  #:nodoc:
         relation = @relation
                        .includes(@ar_options[:include])
                        .joins(@ar_options[:joins])
-                       .group(@ar_options[:group])
                        .merge(@ar_options[:conditions])
+        relation = relation.group(@ar_options[:group]) if @ar_options[:group].present?
         relation = add_references relation
         relation = apply_sort_by relation
 
@@ -595,7 +595,7 @@ def get_custom_order_reference
         end
       end
 
-      return custom_order if custom_order.nil? || custom_order.is_a?(Arel::Attributes::Attribute)
+      return custom_order if custom_order.nil? || custom_order.is_a?(Arel::Attributes::Attribute) || custom_order.is_a?(Arel::Nodes::SqlLiteral)
       return custom_order.gsub(/\?/, fully_qualified_column_name) if custom_order.is_a?(String)
       return custom_order.call(fully_qualified_column_name) if custom_order.is_a?(Proc)
       raise WiceGridArgumentError.new("invalid custom order #{custom_order.inspect}")