some convenience

database.py

@@ -65,6 +65,7 @@ class Dataset(dj.Manual):
 
     @property
     def cells(self, restrictions:dict=None):
+
         cs = (Cell & (CellDatasetMap & self) & restrictions).fetch()
         return cs
 
@@ -112,11 +113,29 @@ class Subject(dj.Manual):
     def subjects(species=None):
         subjs = []
         if species:
-            subjs = (Subject & "species like '\%%s\%'"%species).fetch()
+            subjs = (Subject & "species like '%{0:s}%'".format(species)).fetch()
         else:
             subjs = (Subject & True).fetch()
         return subjs
 
+    @staticmethod
+    def unique_species():
+        all_species = (Subject &True).fetch("species")
+        return np.unique(all_species)
+
+    @property
+    def cells(self):
+        cs = Cell & self
+        return cs
+
+    @property
+    def properties(self):
+        return (SubjectProperties & self).fetch1()
+
+    #@property
+    #def datasets(self):
+    #    retrun
+
 @schema
 class SubjectDatasetMap(dj.Manual):
     definition = """
@@ -174,6 +193,25 @@ class Cell(dj.Manual):
             return d
         return tup
 
+    @property
+    def subject(self):
+        return Subject & self
+
+    @staticmethod
+    def celltypes():
+        return np.unique(Cell.fetch("cell_type"))
+
+    @staticmethod
+    def cells(celltype=None, species=None, quality="good"):
+        cs = Cell * CellDatasetMap * Dataset * Subject
+        if celltype:
+            cs = cs & "cell_type like '{0:s}'".format(celltype)
+        if species:
+            cs = cs & "species like '%{0:s}%'".format(species)
+        if quality:
+            cs = cs & "quality like '{0:s}'".format(quality)
+        return cs
+
 
 @schema
 class CellDatasetMap(dj.Manual):