diff --git a/js/model.js b/js/model.js
index 413f614320..5a2ba9af04 100644
--- a/js/model.js
+++ b/js/model.js
@@ -48,9 +48,86 @@ Sao.Model = Class(Object, {
 Sao.Group = function(model, context, array) {
     array.model = model;
     array.context = context;
+    array.parent = undefined;
+    array.parent_name = '';
+    array.child_name = '';
+    array.parent_datetime_field = undefined;
+    array.record_removed = [];
+    array.record_deleted = [];
     array.forEach(function(e, i, a) {
         e.group = a;
     });
+    array.load = function(ids) {
+        var new_records = [];
+        for (var i = 0, len = ids.length; i < len; i++) {
+            var id = ids[i];
+            var new_record = this.get(id);
+            if (!new_record) {
+                new_record = new Sao.Record(this.model, id);
+                new_record.group = this;
+                this.push(new_record);
+            }
+            new_records.push(new_record);
+        }
+        // Remove previously removed or deleted records
+        var record_removed = [];
+        for (var i = 0, len = this.record_removed.length; i < len; i++) {
+            var record = this.record_removed[i];
+            if (ids.indexOf(record.id) < 0) {
+                record_removed.push(record);
+            }
+        }
+        this.record_removed = record_removed;
+        var record_deleted = [];
+        for (var i = 0, len = this.record_deleted.length; i < len; i++) {
+            var record = thos.record_deleted[i];
+            if (ids.indexOf(record.id) < 0) {
+                record_deleted.push(record);
+            }
+        }
+        this.record_deleted = record_deleted;
+    };
+    array.get = function(id) {
+        // TODO optimize
+        for (var i = 0, len = this.length; i < len; i++) {
+            var record = this[i];
+            if (record.id == id) {
+                return record;
+            }
+        }
+    };
+    array.new = function(default_, id) {
+        var record = Sao.Record(this.name, id);
+        record.model = this.model;
+        record.group = this;
+        if (default_) {
+            record.default_get();
+        }
+        return record;
+    };
+    array.add = function(record, position) {
+        if (position == undefined) {
+            position = -1;
+        }
+        if (record.group != this) {
+            record.group = group;
+        }
+        this.splice(position, 0, record);
+        for (var record_rm in this.record_removed) {
+            if (record_rm.id == record.id) {
+                this.record_removed.splice(
+                        this.record_removed.indexOf(record_rm), 1);
+            }
+        }
+        for (var record_del in this.record_deleted) {
+            if (record_del.id == record.id) {
+                this.record_deleted.splice(
+                        this.record_deleted.indexOf(record_del), 1);
+            }
+        }
+        record.changed['id'] = true;
+        return record;
+    };
     return array;
 };
 
@@ -69,34 +146,21 @@ Sao.Record = Class(Object, {
     has_changed: function() {
         return !jQuery.isEmptyObject(this._changed);
     },
-    _get_values: function(fields) {
-        if (!fields) {
-            fields = Object.keys(this._values);
-        }
-        var values = {};
-        for (var i = 0, len = fields.length; i < len; i++) {
-            var name = fields[i];
-            var field = this.model.fields[name];
-            values[name] = field.get(this);
-        }
-        return values;
-    },
     save: function() {
         var context = this.get_context();
         var prm, values;
         if (this.id < 0) {
-            values = this._get_values();
+            values = this.get();
             prm = this.model.execute('create', [values], context);
             var created = function(id) {
                 this.id = id;
             };
             prm.done(created.bind(this));
         } else {
-            if (!this.has_changed()) {
-                return jQuery.when();
+            values = this.get(true);
+            if (!jQuery.isEmptyObject(values)) {
+                prm = this.model.execute('write', [this.id, values], context);
             }
-            values = this._get_values(Object.keys(this._changed));
-            prm = this.model.execute('write', [this.id, values], context);
         }
         prm.done(this.reload.bind(this));
         return prm;
@@ -224,6 +288,23 @@ Sao.Record = Class(Object, {
             this._loaded[name] = true;
         }
     },
+    get: function() {
+        var value = {};
+        for (var name in this.model.fields) {
+            if (!this.model.fields.hasOwnProperty(name)) {
+                continue;
+            }
+            var field = this.model.fields[name];
+            if (field.description.readonly) {
+                continue;
+            }
+            if ((this._changed[name] == undefined) && this.id >= 0) {
+                continue;
+            }
+            value[name] = field.get(this);
+        }
+        return value;
+    },
     get_context: function() {
         return this.group.context;
     },
@@ -238,6 +319,37 @@ Sao.Record = Class(Object, {
     },
     field_set_client: function(name) {
         this.model.fields[name].set_client(this, value);
+    },
+    default_get: function() {
+        var prm;
+        if (!jQuery.isEmptyObject(this.model.fields)) {
+            prm = this.model.execute('default_get',
+                    [Object.keys(this.model.fields)], this.get_context());
+            var force_parent = function(values) {
+                // TODO
+                return values;
+            };
+            prm = prm.pipe(force_parent).done(this.set_default.bind(this));
+        } else {
+            prm = jQuery.when();
+        }
+        // TODO autocomplete
+        return prm;
+    },
+    set_default: function(values) {
+        for (var fname in values) {
+            if (!values.hasOwnProperty(fname)) {
+                continue;
+            }
+            var value = values[fname];
+            if (!(fname in this.model.fields)) {
+                continue;
+            }
+            // TODO rec_name
+            this.model.fields[fname].set_default(this, value);
+            this._loaded[fname] = true;
+        }
+        // TODO validate
     }
 });
 
@@ -246,6 +358,32 @@ Sao.field = {};
 
 Sao.field.get = function(type) {
     switch (type) {
+        case 'char':
+            return Sao.field.Char;
+        case 'selection':
+            return Sao.field.Selection;
+        case 'datetime':
+            return Sao.field.DateTime;
+        case 'date':
+            return Sao.field.Date;
+        case 'time':
+            return Sao.field.Time;
+        case 'float':
+            return Sao.field.Float;
+        case 'numeric':
+            return Sao.field.Numeric;
+        case 'integer':
+            return Sao.field.Integer;
+        case 'boolean':
+            return Sao.field.Boolean;
+        case 'many2one':
+            return Sao.field.Many2One;
+        case 'one2one':
+            return Sao.field.One2One;
+        case 'one2many':
+            return Sao.field.One2Many;
+        case 'many2many':
+            return Sao.field.Many2Many;
         default:
             return Sao.field.Char;
     }
@@ -274,11 +412,387 @@ Sao.field.Field = Class(Object, {
     get_client: function(record) {
         return this.get(record);
     },
+    set_default: function(record, value) {
+        record._values[this.name] = value;
+        record._changed[this.name] = true;
+    },
     changed: function(record) {
         // TODO
+    },
+    get_context: function(record) {
+        var context = jQuery.extend({}, record.get_context());
+        if (record.parent) {
+            jQuery.extend(context, record.parent.get_context());
+        }
+        // TODO eval context attribute
+        return context;
     }
 });
 
 Sao.field.Char = Class(Sao.field.Field, {
     _default: ''
 });
+
+Sao.field.Selection = Class(Sao.field.Field, {
+    _default: null,
+    get_client: function(record) {
+        return record._values[this.name];
+    }
+});
+
+Sao.field.DateTime = Class(Sao.field.Field, {
+    _default: null
+});
+
+Sao.field.Date = Class(Sao.field.Field, {
+    _default: null
+});
+
+Sao.field.Time = Class(Sao.field.Field, {
+});
+
+Sao.field.Number = Class(Sao.field.Field, {
+    _default: null,
+    get: function(record) {
+        if (record._values[this.name] == undefined) {
+            return this._default;
+        } else {
+            return record._values[this.name];
+        }
+    },
+    digits: function(record) {
+        var default_ = [16, 2];
+        // TODO
+        return default_;
+    }
+});
+
+Sao.field.Float = Class(Sao.field.Number, {
+    set_client: function(record, value) {
+        if (typeof value == 'string') {
+            var value = Number(value); // without new for type conversion
+            if (value == NaN) {
+                value = this._default;
+            }
+        }
+        Sao.field.Float._super.set_client.call(this, record, value);
+    },
+    get_client: function(record) {
+        var value = record._values[this.name];
+        if (value != undefined) {
+            var digits = this.digits(record);
+            return value.toFixed(digits[1]);
+        } else {
+            return '';
+        }
+    }
+});
+
+Sao.field.Numeric = Class(Sao.field.Number, {
+    set_client: function(record, value) {
+        if (typeof value == 'string') {
+            var value = new Number(value); // with new to get an instance
+            if (value.valueOf() == NaN) {
+                value = this._default;
+            }
+        }
+        Sao.field.Float._super.set_client.call(this, record, value);
+    },
+    get_client: function(record) {
+        var value = record._values[this.name];
+        if (value != undefined) {
+            var digits = this.digits(record);
+            return value.toFixed(digits[1]);
+        } else {
+            return '';
+        }
+    }
+});
+
+Sao.field.Integer = Class(Sao.field.Number, {
+    set_client: function(record, value) {
+        if (typeof value == 'string') {
+            value = parseInt(value);
+            if (value == NaN) {
+                value = this._default;
+            }
+        }
+        Sao.field.Integer._super.set_client.call(this, record, value);
+    },
+    get_client: function(record) {
+        var value = record._values[this.name];
+        if (value != undefined) {
+            return '' + value;
+        } else {
+            return '';
+        }
+    },
+    digits: function(record) {
+        return [16, 0];
+    }
+});
+
+Sao.field.Boolean = Class(Sao.field.Field, {
+    _default: false,
+    set_client: function(record, value) {
+        value = Boolean(value);
+        Sao.field.Boolean._super.set_client.call(this, record, value);
+    },
+    get: function(record) {
+        return Boolean(record._values[this.name]);
+    },
+    get_client: function(record) {
+        return Boolean(record._values[this.name]);
+    }
+});
+
+Sao.field.Many2One = Class(Sao.field.Field, {
+    _default: null,
+    get: function(record) {
+        var value = record._values[this.name];
+        // TODO force parent
+        return value;
+    },
+    get_client: function(record) {
+        var rec_name = record._values[this.name + '.rec_name'];
+        if (rec_name == undefined) {
+            this.set(record, this.get(record));
+            rec_name = record._values[this.name + '.rec_name'] || '';
+        }
+        return rec_name;
+    },
+    set: function(record, value) {
+        var rec_name = record._values[this.name + '.rec_name'] || '';
+        // TODO force parent
+        var store_rec_name = function(rec_name) {
+        };
+        if (!rec_name && (value >= 0) && (value != null)) {
+            var prm = record.model.execute('read', [[value], ['rec_name']],
+                record.get_context());
+            prm.done(store_rec_name.bind(this));
+        } else {
+            store_rec_name(rec_name);
+        }
+        record._values[this.name] = value;
+        // TODO force parent
+    },
+    set_client: function(record, value) {
+        var rec_name;
+        if (value instanceof Array) {
+            rec_name = value[1];
+            value = value[0];
+        } else {
+            if (value == this.get(record)) {
+                rec_name = record._values[this.name + '.rec_name'] || '';
+            } else {
+                rec_name = '';
+            }
+        }
+        record._values[this.name + '.rec_name'] = rec_name;
+        Sao.field.Many2One._super.set_client.call(this, record, value);
+    }
+});
+
+Sao.field.One2One = Class(Sao.field.Many2One, {
+});
+
+Sao.field.One2Many = Class(Sao.field.Field, {
+    init: function(description) {
+        Sao.field.One2Many._super.init.call(this, description);
+        this.context = {};
+    },
+    _default: null,
+    set: function(record, value) {
+        var group = record._values[this.name];
+        var fields = {};
+        if (group != undefined) {
+            fields = jQuery.extend({}, group.model.fields);
+            // TODO destroy and unconnect
+        } else if (record.model.name == this.description.relation) {
+            fields = record.model.fields;
+        }
+        group = Sao.Group(new Sao.Model(this.description.relation),
+            this.context, []);
+        group.parent = record;
+        group.parent_name = this.description.relation_field;
+        group.child_name = this.name;
+        group.model.fields = fields;
+        record._values[this.name] = group;
+        group.load(value);
+    },
+    get: function(record) {
+        var group = record._values[this.name];
+        if (group == undefined) {
+            return [];
+        }
+        var record_removed = group.record_removed;
+        var record_deleted = group.record_deleted;
+        var result = [['add', []]];
+        var parent_name = this.description.relation_field || '';
+        for (var i = 0, len = group.length; i < len; i++) {
+            var record2 = group[i];
+            if ((record_removed.indexOf(record2) >= 0) ||
+                (record_deleted.indexOf(record2) >= 0)) {
+                continue;
+            }
+            if (record2.id >= 0) {
+                var values = record2.get();
+                delete values[parent_name];
+                if (record2.has_changed() && !jQuery.isEmptyObject(values)) {
+                    result.push(['write', [record2.id], values]);
+                }
+                result[0][1].push(record2.id);
+            } else {
+                var values = record2.get();
+                delete values[parent_name];
+                result.push(['create', values]);
+            }
+        }
+        if (jQuery.isEmptyObject(result[0][1])) {
+            result.shift();
+        }
+        if (!jQuery.isEmptyObject(record_removed)) {
+            result.push(['unlink', record_removed.map(function(r) {
+                return r.id;
+            })]);
+        }
+        if (!jQuery.isEmptyObject(record_deleted)) {
+            result.push(['delete', record_deleted.map(function(r) {
+                return r.id;
+            })]);
+        }
+        return result;
+    },
+    set_client: function(record, value) {
+    },
+    get_client: function(record) {
+        this._set_default_value(record);
+        return record._values[this.name];
+    },
+    set_default: function(record, value) {
+        // value is a list of id
+        if ((value instanceof Array) && !isNaN(parseInt(value[0]))) {
+            this.set(record, value);
+            record._changed[this.name] = true;
+            return;
+        }
+        var group = record._values[this.name];
+        var fields = {};
+        if (group != undefined) {
+            fields = jQuery.extend({}, group.mode.fields);
+            // TODO destroy and unconnect
+        } else if (record.model.name == this.description.relation) {
+            fields = record.model.fields;
+        }
+        if (!jQuery.isEmptyObject(fields)) {
+            for (var name in fields) {
+                if (fields.hasOwnProperty(name)) {
+                    fields[name] = fields[name].description;
+                }
+            }
+        }
+        var prm = jQuery.when();
+        prm.pipe(function() {
+            return fields;
+        });
+        if (!jQuery.isEmptyObject(value)) {
+            var context = this.get_context();
+            var field_names = {};
+            for (var val in value) {
+                if (!value.hasOwnProperty(val)) {
+                    continue;
+                }
+                for (var fieldname in val) {
+                    if (!val.hasOwnProperty(fieldname)) {
+                        continue;
+                    }
+                    field_names[fieldname] = true;
+                }
+            }
+            if (!jQuery.isEmptyObject(field_names)) {
+                var args = {
+                    'method': 'model.' + this.description.relation +
+                        '.fields_get',
+                    'params': [Object.keys(field_names), context]
+                };
+                prm = Sao.rpc(args, record.model.session);
+                prm.pipe(function(new_fields) {
+                    return jQuery.extend(fields, new_fields);
+                });
+            }
+        }
+        var set_value = function(fields) {
+            var group = Sao.Group(new Sao.Model(this.description.relation),
+                    this.context, []);
+            group.parent = record;
+            group.parent_name = this.description.relation_field;
+            group.child_name = this.name;
+            group.model.add_fields(fields);
+            if (record._values[this.name] != undefined) {
+                for (var i = 0, len = record._values[this.name].length; i < len;
+                        i++) {
+                    var r = record._values[this.name][i];
+                    if (r.id >= 0) {
+                        group.record_deleted.push(r);
+                    }
+                }
+                jQuery.extend(group.record_deleted,
+                        record._values[this.name].record_deleted);
+                jQuery.extend(group.record_removed,
+                        record._values[this.name].record_removed);
+            }
+            record._values[this.name] = group;
+            for (var val in value) {
+                if (!value.hasOwnProperty(val)) {
+                    continue;
+                }
+                var new_record = group.new(false);
+                new_record.set_default(val);
+                group.add(new_record);
+            }
+        };
+        prm.done(set_value.bind(this));
+    },
+    _set_default_value: function(record) {
+        if (record._values[this.name] != undefined) {
+            return;
+        }
+        var group = Sao.Group(new Sao.Model(this.description.relation),
+                this.context, []);
+        group.parent = record;
+        group.parent_name = this.description.relation_field;
+        group.child_name = this.name;
+        if (record.model.name == this.description.relation) {
+            group.fields = record.model.fields;
+        }
+        record._values[this.name] = group;
+    }
+});
+
+Sao.field.Many2Many = Class(Sao.field.One2Many, {
+    set: function(record, value) {
+        var group = record._values[this.name];
+        var fields = {};
+        if (group != undefined) {
+            fields = jQuery.extend({}, group.model.fields);
+            // TODO destroy and unconnect
+        } else if (record.model.name == this.description.relation) {
+            fields = record.model.fields;
+        }
+        group = Sao.Group(new Sao.Model(this.description.relation),
+            this.context, []);
+        group.parent = record;
+        group.parent_name = this.description.relation_field;
+        group.child_name = this.name;
+        group.model.fields = fields;
+        if (record._values[this.name] != undefined) {
+            jQuery.extend(group.record_removed, record._values[this.name]);
+            jQuery.extend(group.record_deleted,
+                record._values[this.name].record_deleted);
+            jQuery.extend(group.record_removed,
+                record._values[this.name].record_removed);
+        }
+        record._values[this.name] = group;
+        group.load(value);
+    }
+});
diff --git a/js/screen.js b/js/screen.js
index 1acd330d1d..58728fa17d 100644
--- a/js/screen.js
+++ b/js/screen.js
@@ -40,6 +40,18 @@ Sao.Screen = Class(Object, {
         var fields = view.fields;
         var xml_view = jQuery(jQuery.parseXML(arch));
         // TODO loading lazy/eager
+        var loading = 'eager';
+        if (xml_view.children().prop('tagName') == 'form') {
+            loading = 'lazy';
+        }
+        for (var field in fields) {
+            if (!(field in this.model.fields) || loading == 'eager') {
+                fields[field]['loading'] = loading;
+            } else {
+                fields[field]['loading'] = this.model.fields[field]
+                    .description.loading;
+            }
+        }
         this.model.add_fields(fields);
         var view = Sao.View.parse(this, xml_view, view.field_childs);
         this.views.push(view);
diff --git a/js/view.js b/js/view.js
index 567da62fdf..278e4c184e 100644
--- a/js/view.js
+++ b/js/view.js
@@ -183,12 +183,8 @@ Sao.View.Tree.Row = Class(Object, {
             var children_field = this.children_field;
             console.log('Load children of ' + this.path);
             record.load(this.children_field).done(function() {
-                var children = record.field_get(children_field);
-                var subgroup = Sao.Group(record.model, record.group.context,
-                    children.map(function(id) {
-                        return new Sao.Record(record.model, id);
-                    }));
-                subgroup.forEach(add_row);
+                var children = record.field_get_client(children_field);
+                children.forEach(add_row);
             });
         }
     },
diff --git a/tests/sao.js b/tests/sao.js
index 71f1282890..afeb235188 100644
--- a/tests/sao.js
+++ b/tests/sao.js
@@ -42,6 +42,9 @@ QUnit.test('CRUD', function() {
             user.model.fields['name'].set_client(user, 'Test');
             user.model.fields['login'].set_client(user, 'test');
         });
+        prm = prm.pipe(function() {
+            return user.default_get();
+        });
         prm = prm.pipe(function() {
             return user.save();
         });
@@ -90,7 +93,7 @@ QUnit.test('CRUD', function() {
     };
 
     QUnit.stop();
-    QUnit.expect(6);
+    QUnit.expect(11);
     var prm = Sao.rpc({
         'method': 'common.db.create',
         'params': [SaoTest.dbname, SaoTest.password,