Support JSON::Any type in database operations

- Updated `json` method in `src/table.cr` to use `JSON::Any` type for columns.
- Modified `src/insert.cr` and `src/update.cr` to handle `JSON::Any` type correctly during insert and update operations.
- Added `JSON::Any` to the list of supported types in `src/cql.cr`.
- Enhanced test in `spec/adapters/postgres_schema_spec.cr` to validate JSON::Any handling in insert and update operations.

spec/adapters/postgres_schema_spec.cr

@@ -25,13 +25,27 @@ describe Cql::Schema do
     # end
 
     it "fetches user preferences" do
+      payload_json = %({"theme": "dark"})
+      json_any = JSON.parse(payload_json)
+
       Example
         .insert
         .into(:user_pref)
-        .values(preferences: %({"theme": "dark"}))
+        .values(preferences: json_any)
         .commit
       result = Example.query.from(:user_pref).limit(1).first!(UserPref)
       result.preferences.should be_a(JSON::Any)
+      result.preferences.should eq(json_any)
+
+      Example
+        .update
+        .table(:user_pref)
+        .set(preferences: json_any)
+        .where { user_pref.id.eq(1_i64) }
+        .commit
+
+      result.preferences.should be_a(JSON::Any)
+      result.preferences.should eq(json_any)
     end
   end
 

src/cql.cr

@@ -37,7 +37,8 @@ module Cql
               String.class |
               Time.class |
               UUID.class |
-              Nil.class
+              Nil.class |
+              JSON::Any.class
 
   # :nodoc:
   DB_TYPE_MAPPING = {

src/insert.cr

@@ -231,7 +231,13 @@ module Cql
 
       @columns = keys if @columns.empty?
 
-      vals = fields.values.map { |v| v.as(DB::Any) }
+      vals = fields.values.map do |v|
+        if v.is_a?(JSON::Any)
+          v.to_json.as(DB::Any)
+        else
+          v.as(DB::Any)
+        end
+      end
       @values << vals.to_a
     end
 

src/table.cr

@@ -302,7 +302,7 @@ module Cql
     end
 
     def json(name : Symbol, as as_name : String? = nil, null : Bool = false, default : DB::Any = nil, unique : Bool = false, index : Bool = false)
-      col = Column(String).new(name, String, as_name, null, default, unique)
+      col = Column(JSON::Any).new(name, JSON::Any, as_name, null, default, unique)
       col.table = self
       @columns[name] = col
       col.index = index ? add_index(columns: [name], unique: unique) : nil

src/update.cr

@@ -255,7 +255,12 @@ module Cql
       setters.each do |k, v|
         column = find_column(k)
         column.validate!(v)
-        @setters << Expression::Setter.new(Expression::Column.new(column), v)
+        val = if v.is_a?(JSON::Any)
+                v.to_json.as(DB::Any)
+              else
+                v.as(DB::Any)
+              end
+        @setters << Expression::Setter.new(Expression::Column.new(column), val)
       end
     end