why is the slice_id in params not inconsistent with the actual id?

[flametest]

created_on | 2016-08-26 19:06:30.122167
changed_on | 2016-10-17 19:44:01.940737
id | 156
slice_name | for_test
druid_datasource_id | 12
table_id |
datasource_type | druid
datasource_name | test_datasource
viz_type | table
params | {\r
| "add_to_dash": "false",\r
| "collapsed_fieldsets": "",\r
| "datasource_id": "12",\r
| "datasource_name": "hotel_mdw_order_v3",\r
| "datasource_type": "druid",\r
| "druid_time_origin": "",\r
| "flt_col_0": "advance_booking_days",\r
| "flt_col_1": "city_code",\r
| "flt_col_2": "terminal_channel_type",\r
| "flt_eq_0": "",\r
| "flt_eq_1": "beijing_city,shanghai_city,chengdu,guangzhou,hangzhou,chongqing_city,shenzhen,xian,xiamen,sanya,wuhan,nanjing,changsha,kunming,qingdao,suzhou_jiangsu,lijiang,tianjin_city,zhengzhou,hongkong_city,dali,hefei,jinan,haerbin,haikou,dalian,guilin,nanning,fuzhou_fujian,shenyang,guiyang,zhuhai,shijiazhuang,ningbo,taiyuan,wulumuqi,nanchang,wuxi,jiaxing,dongguan,",\r
| "flt_eq_2": "app",\r
| "flt_op_0": "in",\r
| "flt_op_1": "in",\r
| "flt_op_2": "in",\r
| "goto_dash": "false",\r
| "granularity": "1 hour",\r
| "groupby": [\r
| "order_date",\r
| "country_name",\r
| "province_name",\r
| "city_name"\r
| ],\r
| "having_col_0": "advance_booking_days",\r
| "having_eq_0": "",\r
| "having_op_0": ">",\r
| "include_search": "false",\r
| "metrics": [\r
| "\u95f4\u591c\u5e73\u5747\u623f\u8d39"\r
| ],\r
| "new_dashboard_name": "",\r
| "new_slice_name": "\u5206\u57ce\u5e02\uff08\u91cd\u70b9\uff09APP",\r
| "number_format": "r",\r
| "rdo_save": "saveas",\r
| "row_limit": "50000",\r
| "save_to_dashboard_id": "",\r
| "since": "2016-8-20",\r
| "slice_id": "155",\r
| "slice_name": "\u5206\u57ce\u5e02\uff08\u91cd\u70b9\uff09APP",\r
| "table_timestamp_format": "smart_date",\r
| "until": "2016-8-21",\r
| "userid": "52",\r
| "viz_type": "table"\r
| }
created_by_fk | 52
changed_by_fk | 54
description |
cache_timeout |
perm | [Druid Cluster].test_datasource

In table slices of caravel database, why is the id of slice not the same as the slice_id in params column?

json_endpoint url requested in dashboard is generated using the items in params.

And as a result the json_endpoint url pass the wrong slice_id.

`class Caravel(BaseCaravelView):

"""The base views for Caravel!"""

@has_access
@expose("/explore/<datasource_type>/<datasource_id>/")
@expose("/datasource/<datasource_type>/<datasource_id>/")  # Legacy url
@log_this
def explore(self, datasource_type, datasource_id):

    error_redirect = '/slicemodelview/list/'
    datasource_class = models.SqlaTable \
        if datasource_type == "table" else models.DruidDatasource
    datasources = (
        db.session
        .query(datasource_class)
        .all()
    )
    datasources = sorted(datasources, key=lambda ds: ds.full_name)
    datasource = [ds for ds in datasources if int(datasource_id) == ds.id]
    datasource = datasource[0] if datasource else None
    slice_id = request.args.get("slice_id")`

[flametest]

fixed in #547