在图片管理里添加了校验方法之后，发现在更新的时候页面不显示校验报错的信息
class Picture < ApplicationRecord belongs_to :imageable, polymorphic: true validates_uniqueness_of :name, scope: [:imageable_id, :imageable_type] end
update!在校验的时候会抛出异常，导致ajax操作中断，
Started PATCH "/components/11" for 127.0.0.1 at 2016-09-06 14:31:08 +0800 Processing by ComponentsController#update as JS Parameters: {"utf8"=>"✓", "component"=>{"name"=>"3131", "alias"=>"", "pictures_attributes"=>[{"id"=>"33", "name"=>"poster", "url"=>"0510000057CE600F6714C06411004555", "md5"=>"9ff2d30b17de8fc75163faff99c18afc"}, {"id"=>"34", "name"=>"poster", "url"=>"0510000057CE60BF6714C063340BE1DC", "md5"=>"c5641765c087043ddc937ac5938c98d2"}, {"name"=>"poster", "url"=>"", "md5"=>""}], "release_id"=>"1", "component_type_id"=>"6", "x_axis"=>"", "y_axis"=>"", "width"=>"", "height"=>"", "unitary"=>"true", "ratio"=>"", "column"=>"", "hints"=>{"left"=>"", "mid"=>"", "right"=>""}, "remark"=>""}, "commit"=>"更新模块", "id"=>"11"} User Load (0.3ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1 Component Load (0.2ms) SELECT `components`.* FROM `components` WHERE `components`.`id` = 11 LIMIT 1 (0.1ms) BEGIN Picture Load (0.2ms) SELECT `pictures`.* FROM `pictures` WHERE `pictures`.`imageable_id` = 11 AND `pictures`.`imageable_type` = 'Component' AND `pictures`.`id` IN (33, 34) Picture Exists (0.4ms) SELECT 1 AS one FROM `pictures` WHERE `pictures`.`name` = BINARY 'poster' AND (`pictures`.`id` != 34) AND `pictures`.`imageable_type` = 'Component' LIMIT 1 Component Exists (0.2ms) SELECT 1 AS one FROM `components` WHERE `components`.`name` = BINARY '3131' AND (`components`.`id` != 11) AND `components`.`release_id` = 1 LIMIT 1 (0.2ms) ROLLBACK Completed 422 Unprocessable Entity in 23ms (ActiveRecord: 3.4ms) ActiveRecord::RecordInvalid (验证失败: Pictures name已经被使用):
原因是在controller的update方法里加了！，变成了update!(component_params), 去掉后的方法如下
def update if @component.update(component_params) redirect_to @component, notice: 'Component was successfully updated.' else render :error end end
去掉后的log如下
Started PATCH "/components/11" for 127.0.0.1 at 2016-09-06 15:21:37 +0800 Processing by ComponentsController#update as JS Parameters: {"utf8"=>"✓", "component"=>{"name"=>"3131", "alias"=>"", "pictures_attributes"=>[{"id"=>"33", "name"=>"poster", "url"=>"0510000057CE600F6714C06411004555", "md5"=>"9ff2d30b17de8fc75163faff99c18afc"}, {"id"=>"34", "name"=>"poster", "url"=>"0510000057CE60BF6714C063340BE1DC", "md5"=>"c5641765c087043ddc937ac5938c98d2"}, {"name"=>"poster", "url"=>"", "md5"=>""}], "release_id"=>"1", "component_type_id"=>"6", "x_axis"=>"", "y_axis"=>"", "width"=>"", "height"=>"", "unitary"=>"true", "ratio"=>"", "column"=>"", "hints"=>{"left"=>"", "mid"=>"", "right"=>""}, "remark"=>""}, "commit"=>"更新模块", "id"=>"11"} User Load (0.2ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1 Component Load (0.1ms) SELECT `components`.* FROM `components` WHERE `components`.`id` = 11 LIMIT 1 (0.1ms) BEGIN Picture Load (0.1ms) SELECT `pictures`.* FROM `pictures` WHERE `pictures`.`imageable_id` = 11 AND `pictures`.`imageable_type` = 'Component' AND `pictures`.`id` IN (33, 34) Picture Exists (0.2ms) SELECT 1 AS one FROM `pictures` WHERE `pictures`.`name` = BINARY 'poster' AND (`pictures`.`id` != 34) AND `pictures`.`imageable_type` = 'Component' LIMIT 1 Component Exists (0.2ms) SELECT 1 AS one FROM `components` WHERE `components`.`name` = BINARY '3131' AND (`components`.`id` != 11) AND `components`.`release_id` = 1 LIMIT 1 (0.1ms) ROLLBACK Rendering components/error.js.erb Picture Load (0.2ms) SELECT `pictures`.* FROM `pictures` WHERE `pictures`.`imageable_id` = 11 AND `pictures`.`imageable_type` = 'Component' Rendered shared/_image.html.erb (2.6ms) Rendered shared/_image.html.erb (1.4ms) Rendered shared/_image.html.erb (1.5ms) (0.2ms) SELECT `releases`.`version_name`, `releases`.`id` FROM `releases` ORDER BY `releases`.`version_name` DESC (0.2ms) SELECT `component_types`.`name`, `component_types`.`id` FROM `component_types` Rendered components/_form.html.erb (36.7ms) Rendered components/error.js.erb (52.7ms) Completed 200 OK in 111ms (Views: 87.3ms | ActiveRecord: 1.6ms)