Adds endcheck and prestep functions to join table lesson

vector_layers_attributes/Join_table_to_vector_layer/04_open_layer_properties.md

@@ -1,5 +1,5 @@
 * In the **Layers Panel**, right-click the *Blocks 2010* layer and
-  select **Open Attribute Table**
+  select **Properties**
 
     ![open_layer_properties](open_layer_properties.png)
 

vector_layers_attributes/Join_table_to_vector_layer/05_add_vector_join.md

@@ -1,7 +1,5 @@
 * In the **Layers Properties - Blocks 2010**, click the **Join** tab.
 
-    ![open_joins_tab](open_joins_tab.png)
-
 * There are no joins yet for this layer. Click the **Add Join** button
   to create one.
 

vector_layers_attributes/Join_table_to_vector_layer/functions.py

@@ -0,0 +1,25 @@
+from lessons.utils import layerFromName
+
+# Functions
+
+# EndCheck Function
+
+def fieldExists(layername, string):
+    """
+    Check if a layer has a field which name contains the specified string
+    The layer should be of the vector type and be loaded into project.
+    :param layername: Layer's name as visible in the layers panel
+    :param string: string of text
+
+    :return: Boolean
+    """
+
+    layer = layerFromName(layername)
+    if layer is None:
+        return False
+
+    for field in layer.pendingFields():
+        if string in field.name():
+            return True
+
+    return False

vector_layers_attributes/Join_table_to_vector_layer/lesson.yaml

@@ -12,7 +12,28 @@ lesson:
       name: Inspect attribute of tabular layer
     - description: 04_open_layer_properties.md
       name: Open layer properties
+
+      prestep:
+        name: utils.unmodalWidget
+        params:
+        - QgsVectorLayerPropertiesBase
+        - 300
+        - 1000
+
     - description: 05_add_vector_join.md
       name: Add vector join
+
+      prestep:
+        name: utils.unmodalWidget
+        params:
+        - QgsJoinDialog
+        - 300
+        - 1000
+
+      endcheck:
+        name: fieldExists
+        params:
+          - Blocks 2010
+          - TOTAL_POP
     - description: 06_inspect_polygon_layer_attributes_(again).md
       name: Inspect polygon layer attributes (again)